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RM2AG3CY0–. The American journal of anatomy. The layers are the same as in the monkey. Here one can seethe solitary cells in the inner stripe of Baillarger.Fig. lo. Frontal section through tlie lateral geniculate body of the (lo(J, simple and slightly differentiated. The same in the cat.Fig. 14. Frontal section through the lateral geniculate body of the monkey,very much more differentiated than that of Fig. 14. The lateralgeniculate body in man has the same appearance as in themonkey. DESCRIPTION OF PLATE iV. Horizontal section through the hemisphere of the brain of the monkey,(Macacus cynomolgus). C. F
![The origin and influence of the thoroughbred horse . ile it is further characterized by the much less markedcontrast between the light and dark areas of the coat. Thelight areas on the muzzle, buttocks, legs, and under parts being Isabella-coloured^ instead of pure white, and thus much lesssharply differentiated from the fawn of the rest of the body. 1 P. Z. S., 1904, p. 431 (with Plate); cf. Pallas (vii. 92) for Mongoldtthif/i/uetei. 2 From a photograph by the Duchess of Bedford. ^ i.e. the colour of the soiled linen of Isabella of Castile. n] THE EXISTING EQUIDAE 45 The general colour is pal Stock Photo](https://c8.alamy.com/comp/2ANC8EY/the-origin-and-influence-of-the-thoroughbred-horse-ile-it-is-further-characterized-by-the-much-less-markedcontrast-between-the-light-and-dark-areas-of-the-coat-thelight-areas-on-the-muzzle-buttocks-legs-and-under-parts-being-isabella-coloured-instead-of-pure-white-and-thus-much-lesssharply-differentiated-from-the-fawn-of-the-rest-of-the-body-1-p-z-s-1904-p-431-with-plate-cf-pallas-vii-92-for-mongoldtthifiuetei-2-from-a-photograph-by-the-duchess-of-bedford-ie-the-colour-of-the-soiled-linen-of-isabella-of-castile-n-the-existing-equidae-45-the-general-colour-is-pal-2ANC8EY.jpg "The origin and influence of the thoroughbred horse . ile it is further characterized by the much less markedcontrast between the light and dark areas of the coat. Thelight areas on the muzzle, buttocks, legs, and under parts being Isabella-coloured^ instead of pure white, and thus much lesssharply differentiated from the fawn of the rest of the body. 1 P. Z. S., 1904, p. 431 (with Plate); cf. Pallas (vii. 92) for Mongoldtthif/i/uetei. 2 From a photograph by the Duchess of Bedford. ^ i.e. the colour of the soiled linen of Isabella of Castile. n] THE EXISTING EQUIDAE 45 The general colour is pal Stock Photo")
RM2ANC8EY–The origin and influence of the thoroughbred horse . ile it is further characterized by the much less markedcontrast between the light and dark areas of the coat. Thelight areas on the muzzle, buttocks, legs, and under parts being Isabella-coloured^ instead of pure white, and thus much lesssharply differentiated from the fawn of the rest of the body. 1 P. Z. S., 1904, p. 431 (with Plate); cf. Pallas (vii. 92) for Mongoldtthif/i/uetei. 2 From a photograph by the Duchess of Bedford. ^ i.e. the colour of the soiled linen of Isabella of Castile. n] THE EXISTING EQUIDAE 45 The general colour is pal
RM2AXJ01W–The embryology and metamorphosis of the Macroura . stage, are clearly differentiated at thisperiod. An incomplete layer of elongated ceil.s (probably mesoblastic in origin com-? ug from wandering yolk cells), Mes., Figs. 131, 132, is seen between the yolk andthe neural thickening, from which the nervous system is in process of <levelopmontIn Fig. 134 rudimentary muscles suspend the stomoda^um to the body wall, and inFigs. 133 and 135 the three germinal layers can be clearly seen. The heart is repre-•sented by the space filled with mesoblast and sernm, between the entoblastic lamellaand the
RM2AJ46RC–The origin of disease : especially of disease resulting from intrinsic as opposed to extrinsic causes : with chapters on diagnosis, prognosis, and treatment . amorphous material and loose shreds, d denotes the region shown morehighly magnified by Fig. 123. At d is a Malpighian body almost uncovered in the cyst-cavity. There is nowhere any differentiated cyst-wall ; the contents of the cyst lay di-rectly in contact with the kidney tissue. Fig. 123.—Renal Cyst without Fibrous Wall, (x 105.) The region d in Fig. 122, more highly magnified. The same relative position has beenmaintained. The Malpig
RM2AM4J5J–Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . ANCYLOCERAS BIPUNCTATUM AND NEANCYLOCERAS 231. Fig. 9. Exiteloceras bipunctatum (Schliiter, 1872). A. Gigantic body chamber fragment GPIG-17. B. Body chamber fragment with differentiated ribbing and shallow constriction. GPIG-13. C. Slightly curved body chamber fragment GPIG-7. D. Straight body chamber fragment GPIG-11. All from the Upper Campanian of Ahlten, West Germany, x 1. 232 ANNALS OF THE SOUTH AFRICAN MUSEUM On the basis of the material available, it is not possible to give a definitiveanswer to these question
RM2AJ206F–Quarterly journal of microscopical science . well-differentiated reactions give in response to strong .stimulation.It takes the animal away from what might be a dangerousobject. In Planaria the portion of the body which takes partin the turning away varies with the strength of the stimulusto a certain degree. Stimuli just strong enough to call forththe negative reaction will cause only the head to be turnedaway. The first turn away of the definite reaction never in-. FlG. Id. — Diaf^ram sliowincj ilie form of tlio no|Tative reaction to mcclian-iral stimuli. A sliows tlio position just, before
RM2AFX2CM–. A treatise on the nervous diseases of children, for physicians and students. Fig. 118.—Section through cervical enlargement, showing cell changes in anteriorgray matter. (Van Gieson stain.) cell-body is completely altered; the entire cell protoplasm has become disin-tegrated, leaving a more or less homogeneous mass; the nucleus has been. ^@^3#^€> k Fig. 119.—Section through a lumbar ganglion. Nissl stain showing marked cell changes. shifted commonly to some part of the periphery of the cell, and instead ofbeing distinctly differentiated from the rest of the cell-body, it generally 468 TH
RM2AG3RB7–. Bulletin - United States National Museum. gnathopod propod, shorter dactyl claws of gnathopods,presence of rastellate setae on segment 5 of both gnathopods, andlarger coxal gills. Further differentiated from other species of theemarginatus subgroup by having up to 18 apical spines on telson.Known only from a single male. Length, 14.25 mm. Male (holotype): Antenna 1, 50 percent as long as body, about40 percent longer than antenna 2; primary flagellum with 28 segments;accessory flagellum reaching about 1/2 the length of 2nd primaryflagellar segment. Antenna 2: pedimcular segments 4 and 5 setos
RM2CDCDC5–. Fungous diseases of plants, with chapters on physiology, culture methods and technique . Fig. 106. Claviceps purpurea: Section of Stroma and EnlargedPerithecium ; also Asci and Spores. (After Tulasne) the head numerous perithecia are formed near the periphery. Sofar as is known, a perithecium is developed in two successivestages : (i) By the repeated division of a few differentiated cellsbelow the surface there results an ellipsoidal pre-ascal tissue. (2) Inthe proximal or basal portion of this cellular body an hymenium ASCOMYCETES 247 originates, and the asci to which it gives rise obtain r
RM2CDAG88–. The microscopy of vegetable foods, with special reference to the detection of adulteration and the diagnosis of mixtures . asm, which in the growing stage is a viscous, stringy, more or less granu-lar substance, but in the dried material has no marked characters; (2) thecell nucleus, a rounded body differentiated by staining and often evidentwithout; and (3) the plastids or chromatophores, including the chloro-plasts, leucoplasts, and chromoplasts. Chloroplasls, or chlorophyl grains, occur in all green parts, and playan important rdle in assimilation (p. 29-) Leucoplasts are inconspicuous, c
RM2CENEGE–. The origin and evolution of life, on the theory of action, reaction and interaction of energy. D EVOLUTION OF LIFE Cambrian strata members of this order differentiated into at least three widely distinct famiUes. The worms, including swimming and burrowing annulates, are represented in the Bur-gess fauna by a very largenumber of specimens, com-prising nineteen species, dis-tributed through elevengenera and six families.Most of these are of theorder Polycha?ta, as, for ex-ample, Worthenella cambria,in which the head is armedwith tentacles, while thesegmented body and thecontinuous series of b
RM2CETJX3–. Guide leaflet. THE DENTITION OF A DOG In generalized mammals the teeth are differentiated into incisors (IN), canines (C), premolars (PM), and molars (M) THE LIVING ORDERS OF MAMMALSMONOTREMATA. ECHIDNA PLATYPUS Monotremata. Egg laying mammals. Monotremes. (3). Themonotremes are a small group of archaic mammals confined to theAustralian region. They are considered the most primitive of all livingmammals because they retain a number of reptilian characters amongwhich are the reptile-like shoulder girdle, low body temperature, and egglaying habit. All higher animals and most primitive forms de
![. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . , approach-ing the polypoid form, may cover aportiim of the true vocal cords. Thesiu-face is smooth and of a dark red color.The disease may be bilateral or uni-lateral. The subjective symptoms arethose of chronic laryngitis. The con-dition may be differentiated from truepolypus, infiltration, etc., lythe use of the sound; wlientouched with this instiument a prolai^se conveys the im-])ression of a hyperplastic or turgescent turbinated body.Tke.t.ment.—Astringents Stock Photo](https://c8.alamy.com/comp/2CDJ40R/a-reference-handbook-of-the-medical-sciences-embracing-the-entire-range-of-scientific-and-practical-medicine-and-allied-science-approach-ing-the-polypoid-form-may-cover-aportiim-of-the-true-vocal-cords-thesiu-face-is-smooth-and-of-a-dark-red-colorthe-disease-may-be-bilateral-or-uni-lateral-the-subjective-symptoms-arethose-of-chronic-laryngitis-the-con-dition-may-be-differentiated-from-truepolypus-infiltration-etc-lythe-use-of-the-sound-wlientouched-with-this-instiument-a-prolaise-conveys-the-im-ression-of-a-hyperplastic-or-turgescent-turbinated-bodytketmentastringents-2CDJ40R.jpg ". A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . , approach-ing the polypoid form, may cover aportiim of the true vocal cords. Thesiu-face is smooth and of a dark red color.The disease may be bilateral or uni-lateral. The subjective symptoms arethose of chronic laryngitis. The con-dition may be differentiated from truepolypus, infiltration, etc., lythe use of the sound; wlientouched with this instiument a prolai^se conveys the im-])ression of a hyperplastic or turgescent turbinated body.Tke.t.ment.—Astringents Stock Photo")
RM2CDJ40R–. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . , approach-ing the polypoid form, may cover aportiim of the true vocal cords. Thesiu-face is smooth and of a dark red color.The disease may be bilateral or uni-lateral. The subjective symptoms arethose of chronic laryngitis. The con-dition may be differentiated from truepolypus, infiltration, etc., lythe use of the sound; wlientouched with this instiument a prolai^se conveys the im-])ression of a hyperplastic or turgescent turbinated body.Tke.t.ment.—Astringents
RM2CNP0EG–. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . ts ofthe ventral surface of its host. The stalk divides and ramifies ina root-like manner within the body of the crab, from whose vitalelements it absorbs its nourishment. The roots spread like amycelium through the whole crab, even to the claws. Peltogaster lives on hermit-crabs. OPOSSUM-SHRIMPS 257 SUBCLASS MALACOSTRACA This subclass comprises highly organized Cnixfacea, usually ofconsiderable size, having the appendages much differentiated, thethorax with eight segments, an
RM2CDFJ4N–. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 90. A and B, optical sections of two pyrenoids (with associated starch grains) of Hydro-dictyon reticulatum (Linn.) Lagerh. x 2250 (after Timberlake). C and D, pyrenoids (withassociated starch grains) of Closterium Ehrenbergii Menegh. x 1250 (after Lutmau); C is anoptical section, and D the surface view; py, pyrenoid ; s, starch grains. pyrenoid is an active body, differentiated in the chlorophyll-bearing cyto-plasm, which in co-operatio
RM2CDHW7B–. Memoirs of the American Entomological Society . nown. Ova can be differentiated by the much thicker,deeper chorionic ridges, irregularly shaped deep depressions, and absenceof a collar. Males and females from the type locality exhibited shorter wings thanother populations examined, although body lengths were similar. In bothmales and females, the wings did not extend beyond the tip of the ab-domen. The mean male and female wing lengths were 6.1 mm and 7.8mm, respectively, compared to 9.1 mm and 10.0 mm from other popula-tions. The head pattern of specimens from the type locality was alsosome
RMRE854F–. Contributions to the study of the behavior of lower organisms. Physiology, Comparative; Infusoria; Amoeba; Irritability. 24 THE BEHAVIOR OF LOWER ORGANISMS. been so slow in appreciating the real nature of the reactions of the in- fusoria. If Stylonychia or Oxytricha or any other of the Hypotricha had been taken as the usual type for study on reactions, many of the theories now maintained could never have been put forth. The body of Paramecium is comparatively little differentiated, so that it is diffi- cult to distinguish oral and aboral sides, and, to multiply this difficulty many times, th
RMRJ4J4P–. The chordates. Chordata. Sauropsida: Class Reptilia 467 The general contour of the reptilian body is less streamlined than that of typical aquatic anamniotes. A cervical region, at most only faintly suggested in anamniotes, is distinctly differentiated in reptiles, and in some, notably turtles, becomes much elongated. Gill-chambers, with the intervening gill-arches and internal gills, require much space. The absence of gills in the reptile permits of considerable narrowing of the region just behind the head and, further, important functional advantage is gained by the narrowing and elongatin
RMRPXN0X–. Text-book of botany, morphological and physiological. Botany. HEPATIC&. 347 in contrast to the Foliose Hepaticae belonging to the family of Jungermannieae, the vegetative body of which consists of a small slender filiform stem, bearing distinctly differentiated leaves {Jungermannia, Radulai Masiigobryum, Frullania^Lophocoleay &c). Between the thalloid and foliose forms of this family are some which present various stages of transition (as Fossombronia and Blasia), The leaves of all Hepaticae are simple plates of cells, in which even the mid-rib usual in the leaves of Mosses is always
RMRJ506C–. Chordate anatomy. Chordata; Anatomy, Comparative. 264 CHORDATE ANATOMY body and the neopallium. These two regions are not clearly differentiated in cyclostomes, but are distinguishable in fishes. Of the two, the pallium changes more. The hemispheres of teleost fishes have a thin epithelial pallium or mantle. Compared with the mantle of teleosts, that of elasmo- branchs and dipnoans, which are more dkectly in the fine of mammaUan ancestry, is relatively thick. Homologies with the palHum of higher vertebrates are difficult on account of the lack of differentiation. In the palHum of fishes the
RMRDTRHH–. Natural history. Zoology. 404 REPTILIA—ORDER ni.—SQUAMATA. interolavicle being cruciform instead of T-shaped ; while, from the latter, it is differentiated by the conformation of the tongue—which, as in the Ignanidce, is not divisible into an interior and posterior portion—as well as by the hollow bases of the teeth, and by the structure of the bony plates, which in one genus underlie the scales. All have a fold of skin covered with small scales along the sides of the body, by which the upper surface is defined from the lower. The head is invested with large and regular shields ; but the bac
RMRD7AT4–. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author;. Blowflies. 688 THE GENERATIVE ORGANS. The body of the testis is seen at this period, in sections, in the anterior part of the fifth abdominal segment. It consists of small closely-packed cells which have a radial arrangement, surrounded by a distinctly differentiated capsule of mesoblastic cells. The Ovary is smaller than the testis on the third day ; it
![. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. NEUROPTERA AND COLEOPTERA 293 with the tail (Fig. 231). By this time the brain (hr) and the ventral nerve cord are well differentiated. The shortening of the body with the con- sequent shrinking and thickening of the dorsal amniotic membrane gives rise to the so called "dorsal organ" which now forms a pear-shaped mass lying in the neck region (Fig. 231, do), its anterior end still attenuated. Soon Stock Photo](https://c8.alamy.com/comp/REYJ9J/embryology-of-insects-and-myriapods-the-developmental-history-of-insects-centipedes-and-millepedes-from-egg-desposition-!-to-hatching-embryology-insects-embryology-myriapoda-neuroptera-and-coleoptera-293-with-the-tail-fig-231-by-this-time-the-brain-hr-and-the-ventral-nerve-cord-are-well-differentiated-the-shortening-of-the-body-with-the-con-sequent-shrinking-and-thickening-of-the-dorsal-amniotic-membrane-gives-rise-to-the-so-called-quotdorsal-organquot-which-now-forms-a-pear-shaped-mass-lying-in-the-neck-region-fig-231-do-its-anterior-end-still-attenuated-soon-REYJ9J.jpg ". Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. NEUROPTERA AND COLEOPTERA 293 with the tail (Fig. 231). By this time the brain (hr) and the ventral nerve cord are well differentiated. The shortening of the body with the con- sequent shrinking and thickening of the dorsal amniotic membrane gives rise to the so called "dorsal organ" which now forms a pear-shaped mass lying in the neck region (Fig. 231, do), its anterior end still attenuated. Soon Stock Photo")
RMREYJ9J–. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. NEUROPTERA AND COLEOPTERA 293 with the tail (Fig. 231). By this time the brain (hr) and the ventral nerve cord are well differentiated. The shortening of the body with the con- sequent shrinking and thickening of the dorsal amniotic membrane gives rise to the so called "dorsal organ" which now forms a pear-shaped mass lying in the neck region (Fig. 231, do), its anterior end still attenuated. Soon
RMRN5TP8–. Animal activities : a first book in zoölogy. Zoology; Animal behavior. I30 ANIMAL ACTIVITIES.. mouth by the tentacles passes into the body-cavity, which is also a stomach. The hydra is really a bag, being hollow, even out in the tentacles. The food moves about inside of this bag and is dissolved there. The hard and useless parts of the food are pushed out through the mouth, which is the only opening into the bag. The nutriment is assimi- lated by the cells lining the bag or stomach-cavity. This lining is called the endoderm and its cells are very little differentiated from the ectoderm, or o
RMRJBE08–. The cell; outlines of general anatomy and physiology. Cells; Anatomy; Physiology; Cells; Anatomy; Physiology. 1G6 THE CELL ternal wall of the capsule, with its opening, becomes differentiated, and around it the contractile sheath develops. b. External Plasmic Products. The external plasmic pro- ducts maybe divided into three groups,—cell membranes, cuticular formations, and intercellular substances. Cell membranes are structures which separate out, and envelop the whole surface of the cell-body. In the vegetable kingdom they are very important, and easily seen, whilst in the animal kingdom t
RMRDJ7HC–. Text-book of embryology. Embryology. XVI ECHINODEKMATA 551 substratum by the secretion of the prae-oral pit. At first it lies with its length parallel to the substratum, but it soon becomes erected so as to stand at right angles to the substratum. The stomo- daeum becomes completely closed from the exterior, and so resembles the amniotic space of the Echinopluteus larva; it rotates backwards along the ventral surface till it comes to occupy the posterior pole of the larva, the body of which becomes differentiated into a narrow anterior portion, the stalk, and a posterior broader part, the cu
RMRHK30N–. The biology of the Protozoa. Protozoa; Protozoa. Fig. 94. -Cyrtophora pedicellafa and Palalinella cyrlophora; flagellates with tentacles and exogenous buds. (After Pascher.) arise from any part of the cell or may be, with the gastric vacuole, confined to the anterior end as in Dinobryon (Fig. 126, p. 259). More complex and more differentiated pseudopodia are found amongst the Cyrtophorida:; of the Chrysomonadida. In Cyrtophora pedicellata the cell body, with its single cup-shaped yellow chromato- phore, is in the form of an inverted pyramid attached by stalk at the apex while the broader ant
RMRHK35N–. The biology of the protozoa. Protozoa; Protozoa. 156 BIOLOGY OF THE PROTOZOA is usually differentiated into a specialized food-collecting, frequently funnel-like structure called the peristome. Cilia on the floor of the peristome are usually longer than in other parts of the body, and in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
![. Comparative anatomy and physiology. Chap. III.] CCELENTERA TA. 37 organisms differentiation will lead to greater sub- division of labour, and greater complexity of struc- ture, but all the materials are, even so low in the grade of animal life, ready to our hand.. Pig. 9—Perigonimus vestitus, showing Tropliosoiues and Gonosomea (After Allman.,) A ccelenterate animal, then, is one in which the archenteron of the gastrula, even when secondary outgrowths are developed from it, remains always as the only cavity in the body, in which the mesoblast is but imperfectly differentiated, but in which o Stock Photo](https://c8.alamy.com/comp/REFJFD/comparative-anatomy-and-physiology-chap-iii-ccelentera-ta-37-organisms-differentiation-will-lead-to-greater-sub-division-of-labour-and-greater-complexity-of-struc-ture-but-all-the-materials-are-even-so-low-in-the-grade-of-animal-life-ready-to-our-hand-pig-9perigonimus-vestitus-showing-tropliosoiues-and-gonosomea-after-allman-a-ccelenterate-animal-then-is-one-in-which-the-archenteron-of-the-gastrula-even-when-secondary-outgrowths-are-developed-from-it-remains-always-as-the-only-cavity-in-the-body-in-which-the-mesoblast-is-but-imperfectly-differentiated-but-in-which-o-REFJFD.jpg ". Comparative anatomy and physiology. Chap. III.] CCELENTERA TA. 37 organisms differentiation will lead to greater sub- division of labour, and greater complexity of struc- ture, but all the materials are, even so low in the grade of animal life, ready to our hand.. Pig. 9—Perigonimus vestitus, showing Tropliosoiues and Gonosomea (After Allman.,) A ccelenterate animal, then, is one in which the archenteron of the gastrula, even when secondary outgrowths are developed from it, remains always as the only cavity in the body, in which the mesoblast is but imperfectly differentiated, but in which o Stock Photo")
RMREFJFD–. Comparative anatomy and physiology. Chap. III.] CCELENTERA TA. 37 organisms differentiation will lead to greater sub- division of labour, and greater complexity of struc- ture, but all the materials are, even so low in the grade of animal life, ready to our hand.. Pig. 9—Perigonimus vestitus, showing Tropliosoiues and Gonosomea (After Allman.,) A ccelenterate animal, then, is one in which the archenteron of the gastrula, even when secondary outgrowths are developed from it, remains always as the only cavity in the body, in which the mesoblast is but imperfectly differentiated, but in which o
![. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. PROTOZOA : GREGARINID^. 47 the protoplasmic body is enclosed may be quite smooth or striated, or it may be furnished with bristles or spines, or even in some cases with cilia. Sometimes one end of the body is furnished with uncinate processes, very similar in appearance to the hooked "head" of the common tape-worm {Tcenia solium). Essentially, however, the structure of all appears to be the same. No differentiated organs of any kind beyond the nucleus and nucleolus exis Stock Photo](https://c8.alamy.com/comp/RDKN8F/a-manual-of-zoology-for-the-use-of-students-with-a-general-introduction-on-the-principles-of-zoology-zoology-protozoa-gregarinid-47-the-protoplasmic-body-is-enclosed-may-be-quite-smooth-or-striated-or-it-may-be-furnished-with-bristles-or-spines-or-even-in-some-cases-with-cilia-sometimes-one-end-of-the-body-is-furnished-with-uncinate-processes-very-similar-in-appearance-to-the-hooked-quotheadquot-of-the-common-tape-worm-tcenia-solium-essentially-however-the-structure-of-all-appears-to-be-the-same-no-differentiated-organs-of-any-kind-beyond-the-nucleus-and-nucleolus-exis-RDKN8F.jpg ". A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. PROTOZOA : GREGARINID^. 47 the protoplasmic body is enclosed may be quite smooth or striated, or it may be furnished with bristles or spines, or even in some cases with cilia. Sometimes one end of the body is furnished with uncinate processes, very similar in appearance to the hooked "head" of the common tape-worm {Tcenia solium). Essentially, however, the structure of all appears to be the same. No differentiated organs of any kind beyond the nucleus and nucleolus exis Stock Photo")
RMRDKN8F–. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. PROTOZOA : GREGARINID^. 47 the protoplasmic body is enclosed may be quite smooth or striated, or it may be furnished with bristles or spines, or even in some cases with cilia. Sometimes one end of the body is furnished with uncinate processes, very similar in appearance to the hooked "head" of the common tape-worm {Tcenia solium). Essentially, however, the structure of all appears to be the same. No differentiated organs of any kind beyond the nucleus and nucleolus exis
![. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. 2l8 THE ASCIDIAXS. "i... vesicles.* All these structures are differentiated from the loose mesenchyme cells, all of which at first course round about the body of the young Ascidian like blood, being kept in motion by the beating of the heart. In the stage shown in Fig. 105 A the mesodermic bands are still fairly compact in front, having extended them- selves anteriorly at the sides of the enteron by interstitial growth. Prceoral Body-cavity and P Stock Photo](https://c8.alamy.com/comp/RJ171N/amphioxus-and-the-ancestry-of-the-vertebrates-microform-vertebrates-chordata-fishes-ascidiacea-vertbrs-cords-poissons-ascidiacs-2l8-the-ascidiaxs-quoti-vesicles-all-these-structures-are-differentiated-from-the-loose-mesenchyme-cells-all-of-which-at-first-course-round-about-the-body-of-the-young-ascidian-like-blood-being-kept-in-motion-by-the-beating-of-the-heart-in-the-stage-shown-in-fig-105-a-the-mesodermic-bands-are-still-fairly-compact-in-front-having-extended-them-selves-anteriorly-at-the-sides-of-the-enteron-by-interstitial-growth-prceoral-body-cavity-and-p-RJ171N.jpg ". Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. 2l8 THE ASCIDIAXS. "i... vesicles.* All these structures are differentiated from the loose mesenchyme cells, all of which at first course round about the body of the young Ascidian like blood, being kept in motion by the beating of the heart. In the stage shown in Fig. 105 A the mesodermic bands are still fairly compact in front, having extended them- selves anteriorly at the sides of the enteron by interstitial growth. Prceoral Body-cavity and P Stock Photo")
RMRJ171N–. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. 2l8 THE ASCIDIAXS. "i... vesicles.* All these structures are differentiated from the loose mesenchyme cells, all of which at first course round about the body of the young Ascidian like blood, being kept in motion by the beating of the heart. In the stage shown in Fig. 105 A the mesodermic bands are still fairly compact in front, having extended them- selves anteriorly at the sides of the enteron by interstitial growth. Prceoral Body-cavity and P
RMRE1RXF–. A manual of Indian botany. Botany. MORPHOLOGY plant body nutritive or vegetative, and the other members reproductive. Our general idea of a plant body, as described above, refers mainly to what are known as the higher classes of plants, with which we are more familiar. There are other plants, however, which belong to what are known as lower classes, with which we are less familiar. In these lower classes the plant body is not differentiated into members, such as roots, stems, leaves, &c., but consists of a uni- form structure. Such a uniform undifferentiated plant body is known as a THAL
RMRN74G6–. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author;. Blowflies. 688 THE GENERATIVE ORGANS. The body of the testis is seen at this period, in sections, in the anterior part of the fifth abdominal segment. It consists of small closely-packed cells which have a radial arrangement, surrounded by a distinctly differentiated capsule of mesoblastic cells. The Ovary is smaller than the testis on the third day ; it i
RMRFPH70–. Carnegie Institution of Washington publication. no Papers from the Marine Biological Laboratory at Tortugas. It is well known that in the development of the skeleton the mesenchyme cells differentiate two triradiate spicules, one on each side of the body. The bars of the triradiate spicules develop unequally. The ventral body rod, the ventral arm rod, and the dorso-ventral connective are formed from the outgrowth of the original three bars. Subsequently the dorsal body rod and the dorsal arm rod are differentiated, and finally the aboral branches of the ventral body rods. In the two examples
RMRE0MMH–. A manual of botany. Botany. 504 MANUAL OP BOTANY and a regulating and controlling part which can co-ordinate the response to stimulation, or can initiate movements, &o., in its absence. In the higher animals these are well differentiated from each other; we have the sense organs and the afferent nerves ; the efferent nerves, connected with the motor and other mechanisms; and the nerve-cells which possess the co-ordinating power. In the much less differentiated plant-body the first two of these at least are recognisable. If we compare the sense organs of the animal with the sensitive part
RMREERFD–. Comparative anatomy. Anatomy, Comparative. 498 COMPARATIVE ANATOMY tionately. Vision in primates is more important than smell, and brain changes express relative functional values. Cortex. Two parts of the primitive vertebrate brain participate specially in the great enlargement of the cerebral hemispheres, the striate body and the neopallium. These two regions are not clearly differentiated in cyclostomes, but are distinguishable in fishes. Of the two, the pallium changes more. The hemispheres of teleost fishes have a thin epithelial pallium or mantle. Compared with the mantle' of teleosts,
RMRPXRYM–. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. $8 COE the head. These are also V-shaped with the angle projecting back- ward on the lateral margins. The ventral limb of each V-shaped fur- row reaches nearly to the opening of the rhynchodaeum ; on the dorsal surface the ends of the dorsal limbs are separated by about y^ the diameter of the body in ordinary states of contraction (fig. 8). In microscopic sections the V-shaped grooves on each side of the head are conspicuous, because of their differentiated epithelium. In these shallow depressions the epithelial cells are of
RMRDYTC0–. Principles of modern biology. Biology. Excretion - 371 spaces of the mesoderm—and drive the re- sulting solution of wastes out of the body, via the excretory ducts. In Annelida, such as the earthworm, the mesodermal tissues are much more abundant and highly differentiated; also there is a well- developed blood system. The excretory or- gans of the earthworm and other Annelida are the nephridia, of which there are usually two in each segment of the body (Fig. 20-3). Each nephridium is a long, highly coiled tube, which leads from the body cavity of one segment to the external surface of the su
RMRMP0N2–. Annals of applied biology. Biology, Economic; Biochemistry. Fig. 19. Leg of second instar. Second instar. emergence. The margin is at first entire except for the cerci and the pair of more anterior spines, both being shorter than in the previous stage. Later, however, a waxy fringe is developed. When this is dissolved, the body margin is seen to have become creiiulated (Fig 17). There is a metathoracic and six abdominal segments differentiated. Tracheal system (Fig. 18). There are dorsal and ventral systems which are connected, and very few small branches are present. There. Please note that
![. Comparative anatomy and physiology. Chap. III.] MOLLUSC A. Si. or asymmetrically developed. The appearance of this torsion allows us to divide the Gastropoda into a lower or more primitive, and a higher or more differentiated series.. a. Isopleura.—In these the two sides of the body are equally developed, and many of the characters of the primitive mollusc are retained unchanged. Here we have the Polyplacopliora, represented by the Chitons, in which the shell is broken up into eight pieces ar- ranged in a fashion to which it is difficult to refuse the name of metameric arrangement (Fig. 38); Stock Photo](https://c8.alamy.com/comp/REFJ09/comparative-anatomy-and-physiology-chap-iii-mollusc-a-si-or-asymmetrically-developed-the-appearance-of-this-torsion-allows-us-to-divide-the-gastropoda-into-a-lower-or-more-primitive-and-a-higher-or-more-differentiated-series-a-isopleurain-these-the-two-sides-of-the-body-are-equally-developed-and-many-of-the-characters-of-the-primitive-mollusc-are-retained-unchanged-here-we-have-the-polyplacopliora-represented-by-the-chitons-in-which-the-shell-is-broken-up-into-eight-pieces-ar-ranged-in-a-fashion-to-which-it-is-difficult-to-refuse-the-name-of-metameric-arrangement-fig-38-REFJ09.jpg ". Comparative anatomy and physiology. Chap. III.] MOLLUSC A. Si. or asymmetrically developed. The appearance of this torsion allows us to divide the Gastropoda into a lower or more primitive, and a higher or more differentiated series.. a. Isopleura.—In these the two sides of the body are equally developed, and many of the characters of the primitive mollusc are retained unchanged. Here we have the Polyplacopliora, represented by the Chitons, in which the shell is broken up into eight pieces ar- ranged in a fashion to which it is difficult to refuse the name of metameric arrangement (Fig. 38); Stock Photo")
RMREFJ09–. Comparative anatomy and physiology. Chap. III.] MOLLUSC A. Si. or asymmetrically developed. The appearance of this torsion allows us to divide the Gastropoda into a lower or more primitive, and a higher or more differentiated series.. a. Isopleura.—In these the two sides of the body are equally developed, and many of the characters of the primitive mollusc are retained unchanged. Here we have the Polyplacopliora, represented by the Chitons, in which the shell is broken up into eight pieces ar- ranged in a fashion to which it is difficult to refuse the name of metameric arrangement (Fig. 38);
RMRN80BH–. Anatomischer Anzeiger. Anatomy, Comparative. 77 separated from the rest of the mesoblast, and running in the length of the embryo. This is joined, at each segment, to the walls of the body cavity, by equally solid columns of cells, the primative segmental tutules. I can see no evidence that the tubules form first and then join the Wolffian duct as has frequently been described. At x fig. 2 are some cells joining the somite with the rest of the tissue: they are differentiating to form connective tissue. In a chick of 40 hrs., fig. 3 A, where the somite has differentiated into two layers, the
RMRDEXFC–. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. I30 ANIMAL ACTIVITIES.. mouth by the tentacles passes into the body-cavity, which is also a stomach. The hydra is really a bag, being hollow, even out in the tentacles. The food moves about inside of this bag and is dissolved there. The hard and useless parts of the food are pushed out through the mouth, which is the only opening into the bag. The nutriment is assimi- lated by the cells lining the bag or stomach-cavity. This lining is called the endoderm and its cells are very little differentiated from the ectoderm, or o
RMREFD14–. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 328 COMPARATIVE MORPHOLOGY OF VERTEBRATES. tional to the total body length. The anterior end of each loses its excretory char- acter and in the male becomes accessory to reproduction, as described above (p. 522). In the anura the organs are more compact and the differentiated anterior end is lacking, though the efferent ductules of the testes pass through the organ. The caecilians (fig. 334) resemble the urodeles, except in having the mesonephroi more lobulated, the result of aggregates of tubules around the co
RMRE1RX9–. A manual of Indian botany. Botany. INTRODUCTION threads. This network of fine threads is the body of a plant called chhata {Mucor) (fig. 2, m), which is perfectly undifferentiated, and thus belongs to the class Thallophyta. The higher plants with their body differentiated into roots, stems, and leaves, or only stems and leaves, are called by way of distinction CoR- MOPHYTA. It is with the Cormo- phyta mainly that we are concerned in this part of the book. If we look round, we see that while a large number of familiar plants are ter- restrial, that is, grow and live on land, others are either
RMRDP6E4–. Outlines of zoology. Zoology. DEVELOPMENT OF THE FROG. 551 at this spot, the blastopore. The embryo elongates slightly, but the mass of yolk-laden cells which lie on the floor of the gut prevents the body acquiring at once the fish-like shape. The blastopore as usual marks the posterior region of the body. The processes which follow are already in outline familiar to the student. Along the mid-dorsal line an epiblastic neural plate is differentiated. The edges become raised into the neural folds; these approach one another, and, fusing together, form the medullary or neural canal. At the pos
RMRE0HY6–. The physiology of reproduction. Reproduction. 116 THE PHYSIOLOGY OF REPRODUCTION account of which was pubUshed in his famous monograph Eierstock und Ei.^ He found that in the chick, on the fourth day of development, the coelomic epithehum which covers the inner surface of the Wolffian body became differentiated from the tissue surrounding it, the cells being relatively large and cuboidal in shape. A httle later he observed that the cells had multiplied to such an extent as to give rise to a distinct elevation. In this way the germinal epithehum was formed, and this marked the site of the fut
RMRE0APM–. A manual of zoology. Zoology. 104 GENERAL PRINCIPLES OF ZOOLOGY. layers of the body. In most animals they are separated by inter- mediate tissues, called collectively mesoderm. The higher the animal, the more differentiated is the mesodermal layer. The primitive digestive cavity lined by entoderm is called the archen-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterl
RMREFAGM–. Comparative anatomy. Anatomy, Comparative. 264 COMPARATIVE ANATOMY the gill cartilages, and are differentiated into levators, depressors, and constrictors of the gills. The lateral trunk muscles of cyclostomes strikingly resemble those of amphioxus. In the region of the body cavity, on the ventral side, an external layer of oblique muscles is differentiated. The most important evolutionary advance, however, appears in the differentiation of six eye muscles. Paired eyes first appear in this group, and with them the same six eye muscles as in all vertebrates up to man. All six are formed from
RMRN5WMN–. Anatomy, descriptive and applied. Anatomy. 816 THE NERVE SYSTEM fibres the axone terminals form chains of flattened disks, the motor end plates. Among gland cells the terminal fibrils form more or less intricate plexuses. Peripheral Nerve Beginnings of Centripetal Neurones.—Nerve beginnings of the centripetal (sensor) fibres are found in nearly all the tissues of the body. They are peculiarly differentiated and of various forms in different localities, and their function is apparently the conversion of mechanical, thermal, chemical, and other stimuli into nerve impulses. The organs of vision
RMRDGHXE–. An introduction to zoology, with directions for practical work (invertebrates). 14 INTRODUCTION TO ZOOLOGY Structure. Cuhck torfex mcdullA -For full investigation of the structure of the body, a compound microscope will be needed. The Vorticella, still attached to the weed, should be mounted in a drop of water, carefully covered with a cover- slip, and examined under the low power of the microscope. It will then be seen that though the body consists of one single mass of protoplasm, this protoplasm is differentiated in different parts of the body; also it is surrounded externally by a delica
![. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 258 arteries throughout the body, prepared by the method above described demonstrates that in general the older teaching is correct: the ex- panded media is formed of concentric, circularly disposed muscle fibres. Here it deserves note that according to my experience the different coats and their component cells are best differentiated by the employ- ment of the following method. The study of a very great number of sections from different arteries throughout the body, prepared by the method above des- "r .'Ä^r ^'^. ^^a, Stock Photo](https://c8.alamy.com/comp/RN7D65/anatomischer-anzeiger-anatomy-comparative-anatomy-comparative-258-arteries-throughout-the-body-prepared-by-the-method-above-described-demonstrates-that-in-general-the-older-teaching-is-correct-the-ex-panded-media-is-formed-of-concentric-circularly-disposed-muscle-fibres-here-it-deserves-note-that-according-to-my-experience-the-different-coats-and-their-component-cells-are-best-differentiated-by-the-employ-ment-of-the-following-method-the-study-of-a-very-great-number-of-sections-from-different-arteries-throughout-the-body-prepared-by-the-method-above-des-quotr-r-a-RN7D65.jpg ". Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 258 arteries throughout the body, prepared by the method above described demonstrates that in general the older teaching is correct: the ex- panded media is formed of concentric, circularly disposed muscle fibres. Here it deserves note that according to my experience the different coats and their component cells are best differentiated by the employ- ment of the following method. The study of a very great number of sections from different arteries throughout the body, prepared by the method above des- "r .'Ä^r ^'^. ^^a, Stock Photo")
RMRN7D65–. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 258 arteries throughout the body, prepared by the method above described demonstrates that in general the older teaching is correct: the ex- panded media is formed of concentric, circularly disposed muscle fibres. Here it deserves note that according to my experience the different coats and their component cells are best differentiated by the employ- ment of the following method. The study of a very great number of sections from different arteries throughout the body, prepared by the method above des- "r .'Ä^r ^'^. ^^a,
RMRFPH7D–. Carnegie Institution of Washington publication. Experimentally Fused Larva oj Echinoderms, etc. 109 satory growth of other parts of the skeleton were observed in varying degrees of complexity in all or nearly all the fused larvae. The two plutei of figure 6 are fused more completely together than the preceding pair of plutei. The two larvae are perfect and the parts are. Left d.a.r. - typical and independent, except the body wall, which is common to both. In the right or A pluteus each of the skeletal parts is differentiated and normal. In the left or B pluteus the ventral body rods are inco
RMRE0B0R–. Zoology for high schools and colleges. Zoology. CHAPTER III. BRANCH III.—CCELENTERATA (Htdroids, Jelly- Fishes and Polyps). General CJharaeters of Coelenterates.—In this branch, which is represented by animals like the Hydra (Fig. 36) and Tubularia (Fig. 35), the body consists of two cell-layers, surrounding a definite, single, digestive cavity, the mouth of the cavity being surrounded ci by a circle of tentacles, which are in polyps hollow and connect with the stomach. The latter, however, is only partly differentiated or set apart from the body, hence the name Cmlenterata (Greek, koiXo?, h
RMRGHE1T–. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 126 BULLETIN OF THE BUREAU OF FISHERIES. fully differentiated, extends more than halfway around the circumference of the yolk sphere. Although the blastoderm early covers a large portion of the surface of the yolk, the blastopore does not close until the embryo is well formed and segmentation of the body has begun (fig. 94). The closure of the blastopore occurs within 16 hours after fertilization. At this time the embryo extends fully two-thirds around the circumference of Cue yolk sphere. Figure 95 illustrates an egg shortly afte
RMREF9T6–. Comparative anatomy. Anatomy, Comparative. 294 COMPARATIVE ANATOMY NASAL ocvmr PALATE MOUTH TONGUE NASAL PHARYNX proper separates the alimentary canal from the body wall. In annelids as in all the higher animals there is no connexion between the two cavities, enteron and coelom. The single tube that forms the body of lower forms has become double, and the muscular activities of the alimentary canal are carried on independently of those of the body wall. Among the forms which He near the main line of human ancestry, pharynx, esophagus, and stomach are first differentiated in urochordates. A l
RMREE542–. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. CHAPTER V.—COMPARATIVE REVIEW.—ASCOMYCETES. 247 described above on page 229, in the case of Pleospora; an intercalary portion of a mycelial filament grows by successive divisions which arise without fixed order in every direction, and the cells thus formed are subsequently differentiated, while branches from adjoining hyphae usually grow up round the new body and thus help to form its wall (see Fig. 118). This is the mode of formation according to Gibelli and Griffini, Eidam
RMRE0C2R–. Senescence and rejuvenescence. Age; Reproduction. Figs. 113, 114.—Cells from the nervous system of the chick embryo: Fig. 113, embryonic cells from neural tube at 31 hours; Fig. 114, differentiated motor cells from spinal cord at 11 days, drawn to the same scale. From embryological preparations of the University of Chicago. an increase in cytoplasmic volume during differentiation. But how can the dendrites and the nerve fiber contribute to decrease the rate of metabolism in the cell body, since they are merely slender outgrowths from it ? The cell body has unquestionably undergone senescence
RMRH8XHH–. Botany for agricultural students. Plants. RED ALGAE (RHODOPHYCEAE) 325 Algae, the plant botly is commonl}^ differentiated into parts similar in form, although not in structure, to the roots, stems, and leaves of the higher plants. The cells are commonly ar- ranged in such definite lines that the plant body has the appear- ance of a bundle of closely joined simple filaments. The evident protoplasmic connections between cells and the gelatinization of cell walls are other notable features.. Fig. 281. — Irish Moss, Chondrus crispus, mucli used for food. Natural size. The life history of some of
![. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. 146 D. LACY. Fig. 4. Electron miciograpli of a small part of the highly differentiated Golgi zone of a neurone. The line A-B in fig. 1 passes throughasimilar region. Magnification 21,000. of the cell body lying next to the nucleus. In larger neurones they extend from the nucleus (which is excentrically placed) into much of the cell body. Additional details of the structure of the Golgi filaments are revealed when cells are treated by Kolatchev"s method and examined by electron mi- croscop Stock Photo](https://c8.alamy.com/comp/RD5WDN/electron-microscopy-proceedings-of-the-stockholm-conference-september-1956-electron-microscopy-146-d-lacy-fig-4-electron-miciograpli-of-a-small-part-of-the-highly-differentiated-golgi-zone-of-a-neurone-the-line-a-b-in-fig-1-passes-throughasimilar-region-magnification-21000-of-the-cell-body-lying-next-to-the-nucleus-in-larger-neurones-they-extend-from-the-nucleus-which-is-excentrically-placed-into-much-of-the-cell-body-additional-details-of-the-structure-of-the-golgi-filaments-are-revealed-when-cells-are-treated-by-kolatchevquots-method-and-examined-by-electron-mi-croscop-RD5WDN.jpg ". Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. 146 D. LACY. Fig. 4. Electron miciograpli of a small part of the highly differentiated Golgi zone of a neurone. The line A-B in fig. 1 passes throughasimilar region. Magnification 21,000. of the cell body lying next to the nucleus. In larger neurones they extend from the nucleus (which is excentrically placed) into much of the cell body. Additional details of the structure of the Golgi filaments are revealed when cells are treated by Kolatchev"s method and examined by electron mi- croscop Stock Photo")
RMRD5WDN–. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. 146 D. LACY. Fig. 4. Electron miciograpli of a small part of the highly differentiated Golgi zone of a neurone. The line A-B in fig. 1 passes throughasimilar region. Magnification 21,000. of the cell body lying next to the nucleus. In larger neurones they extend from the nucleus (which is excentrically placed) into much of the cell body. Additional details of the structure of the Golgi filaments are revealed when cells are treated by Kolatchev"s method and examined by electron mi- croscop
RMRE3T60–. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. THE BRAIN. 543 as a specially differentiated part of the anterior region of the medullary groove and its subdivisions; and the close relation of the eye, ear, etc., to the brain in their early origin, is not without special meaning, while the more diffused sensory de- velopments in the skin connect the higher animals closely with the lower—even the lowest, in which sensation is almost wholly referable to the surface of the body.. Fis. 393. Fig. 392
RMRJ51NN–. Chordate anatomy. Chordata; Anatomy, Comparative. 196 CHORDATE ANATOMY The lateral trunk muscles of cyclostomes strikingly resemble those of Amphioxus. In the region of the body-cavity, on the ventral side, an external layer of oblique muscles is differentiated. The most important evolutionary advance, however, appears in the differentiation of six eye muscles. Paired eyes first appear in this group, and with them six eye muscles like those found in all vertebrates up to man. All six are formed from the first three embryonic myotomes. Like the eye muscles of higher vertebrates, they are inne
RMRDH799–. Natural history of the American lobster... Decapoda (Crustacea); Lobster fisheries. NATURAL HISTORY OF AMERICAN LOBSTER. 315 p.mA decapod crustacean but comparable to the flagellate spermatozoa of other animals. The crustacean sperm becomes differentiated in three parts, namely, (i) the nucleus or head, (2) mitochondral body (a partly fibrous and partly granular structure) repre- senting the neck or middle piece, and (3) the explosive capsule or modified tail. The sperm cell develops processes (fig. 31,1) which in the lobster arise from the neck. They ordinarily appear to be immobile and are
RMRHP59J–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 308 WESLEY R. COE which fills the space formerly occupied by the old proboscis and sheath or in a corresponding position if the fragment was taken posterior to the end of the sheath. During this elongation the walls of the proboscis become differentiated into epithelial, muscular and connective tissue layers, as previously described (Coe, 1934). Xerves grow into the organ from the new brain. REGENERATION OF A NEW BODY FROM A PORTION OF THE HEAD The conditions are somewhat different when a new body is restored from the head a
RMRFPH78–. Carnegie Institution of Washington publication. Left d.a.r. - typical and independent, except the body wall, which is common to both. In the right or A pluteus each of the skeletal parts is differentiated and normal. In the left or B pluteus the ventral body rods are incomplete in. d.v.c.--- Fig. 6. so far as they do not possess their aboral bifurcated branches, and one of the ventral arm rods is abbreviated. The B pluteus in this fusion is incomplete, not with respect to the dorsal rods, as in the previous example, but in the aboral branches of the ventral body rods.. Please note that these
RMRDJF6Y–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. Fig. 106. Claviceps purpurea: Section or Stroma and Enlarged Perithecium ; also Asci and Spores. (After Tulasne) the head numerous perithecia are formed near the periphery. So far as is known, a perithecium is developed in two successive stages : (1) By the repeated division of a few differentiated cells below the surface there results an ellipsoidal pre-ascal tissue. (2) In the proximal or basal portion of this cellular body an hymenium. Please note that these images are extracted
![. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. Fig. 4. Electron miciograpli of a small part of the highly differentiated Golgi zone of a neurone. The line A-B in fig. 1 passes throughasimilar region. Magnification 21,000. of the cell body lying next to the nucleus. In larger neurones they extend from the nucleus (which is excentrically placed) into much of the cell body. Additional details of the structure of the Golgi filaments are revealed when cells are treated by Kolatchev"s method and examined by electron mi- croscopy. The Golgi Stock Photo](https://c8.alamy.com/comp/RD5WDM/electron-microscopy-proceedings-of-the-stockholm-conference-september-1956-electron-microscopy-fig-4-electron-miciograpli-of-a-small-part-of-the-highly-differentiated-golgi-zone-of-a-neurone-the-line-a-b-in-fig-1-passes-throughasimilar-region-magnification-21000-of-the-cell-body-lying-next-to-the-nucleus-in-larger-neurones-they-extend-from-the-nucleus-which-is-excentrically-placed-into-much-of-the-cell-body-additional-details-of-the-structure-of-the-golgi-filaments-are-revealed-when-cells-are-treated-by-kolatchevquots-method-and-examined-by-electron-mi-croscopy-the-golgi-RD5WDM.jpg ". Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. Fig. 4. Electron miciograpli of a small part of the highly differentiated Golgi zone of a neurone. The line A-B in fig. 1 passes throughasimilar region. Magnification 21,000. of the cell body lying next to the nucleus. In larger neurones they extend from the nucleus (which is excentrically placed) into much of the cell body. Additional details of the structure of the Golgi filaments are revealed when cells are treated by Kolatchev"s method and examined by electron mi- croscopy. The Golgi Stock Photo")
RMRD5WDM–. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. Fig. 4. Electron miciograpli of a small part of the highly differentiated Golgi zone of a neurone. The line A-B in fig. 1 passes throughasimilar region. Magnification 21,000. of the cell body lying next to the nucleus. In larger neurones they extend from the nucleus (which is excentrically placed) into much of the cell body. Additional details of the structure of the Golgi filaments are revealed when cells are treated by Kolatchev"s method and examined by electron mi- croscopy. The Golgi
RMRDEAD3–. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CHAPTER V.—COMPARATIVE REVIEW.—ASCOMYCETES. 247 described above on page 229, in the case of Pleospora; an intercalary portion of a mycelial filament grows by successive divisions which arise without fixed order in every direction, and the cells thus formed are subsequently differentiated, while branches from adjoining hyphae usually grow up round the new body and thus help to form its wall (see Fig. ri8). This is the mode of formation according to Gibelli and GrifiBni
RMRJ513N–. Chordate anatomy. Chordata; Anatomy, Comparative. THE DIGESTIVE SYSTEM 217 NASAL PHARYNX proper separates the alimentary canal from the body-wall. In annelids, as in all the higher animals, there is no connexion between the two cavities, enteron and coelom. The single tube that forms the body of lower forms has become double, and the muscular activities of the alimentary canal are carried on independently of those of the body-wall. Among the forms which lie near the main line of human ancestry, pharynx, esophagus, and stomach are first differentiated in urochor- dates. A liver arises in the
RMRGD00T–. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. BAIRDIELLA CHRYSURA AND ANCHOVIA MITCHILU. 13 appearance of adult individuals. However, the depth of the body in the thoraxic region is relatively great and the head is relatively large and blunt. They are also somewhat lighter in color. Figure 24 illustrates a young fish 30 mm. in length. The fins are now fully differentiated and the entire surface of the body is covered with scales. However, the scales are still small and deeply embedded in the skin. They are, therefore, not .it«s'>
RMRDWDC0–. Botany, with agricultural applications. Botany. EED ALGAE (RHODOPHYCEAE) 325 Algae, the plant body is commonly differentiated into parts similar in form, although not in structure, to the roots, stems and leaves of the higher plants. The cells are commonly ar- ranged in such definite Unes that the plant body has the appear- ance of a bundle of closely joined simple filaments. The evident protoplasmic connections between cells and the gelatinization of cell walls are other notable features.. Fig. 281. — Irish Moss, Chondrus crispus, much used for food. Natural size. The life history of some o
RMRH559B–. Breviora. 12 BREVIORA No. 382 premaxillary maxillary palatine. opercle dentary coronomeckelian articular angular quadrate j ijiterhyal symplectic subopercle preopercle interopercle 1 mm Figure 7. Jaws, suspensorium, and opercular bones of 20.7-mm Thrat- tidion noctivagus, medial view. attaches to dorsoanterior portion of quadrate bone. Entoptery- goid and metapterygoid well developed. Sphenotic and pterotic articular surfaces of hyomandibular not strongly differentiated from its main body. Hyomandibular with a distinctively shaped lamella dorsoanterior to its symplectic process, the ventral
RMRDPD49–. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. MAMMALS. 413 Sub-Order 3. Pinnipedia. Aquatic petitadactyl carnivores, with webbed feet fitted for swimming, incisors always less than §, p typically ^, m , no differentiated carnassial; tail very short. The seals and their allies are mostly marine, although some ascend rivers, while one species occurs in Lake Baikal. The body is fitted for an aquatic life ; the basal portion of the fore limbs is imbedded in the general integument, while the web of the toes usually extends beyond the extremity of the clawed digits. The seal
RMRDJKMJ–. Practical anatomy of the rabbit : an elementary laboratory textbook in mammalian anatomy . Rabbits; Anatomy, Comparative. General Anatomy. 19 GENERAL ANATOMY. Although in every respect a continuous structure, the body is differentiated into a large number of parts, or organs, the latter being more or less individual in form, composition, or function. Organs are arranged for the most part in systems, each of which is concerned with some general or fundamental function, to which several organs may contribute. In a more general way the body may be considered as an assemblage of tissues. The lat
RMREF80W–. Comparative anatomy. Anatomy, Comparative. THE NERVOUS SYSTEM 477 the neurons become in all essentials like those of vertebrates, being differentiated either as sensory or motor, while those within the nerve-cord become association-cells. A reflex-arc pattern is thus established, in which the motor and sensory cells involved in the reflex may be either homolateral or heterolateral according as the neurons involved belong to one or to both sides of the body. In insects separate motor and sensory nerve roots appear, reversed in position as compared with vertebrates. Motor roots are dorsal and
RMRFPN51–. Cassell's natural history. Animals; Animal behavior. 324 NATURAL HISTORY. briskiy about by tlie movements of its flagella. It tlieii settles down on some solid body, and flattens out into a disc, which becomes attached by pseudo25odia-like extensions from the flagellated cells around its margin. The flagellated cells, losing their flagella, form the pavement-like cells of the ectoderm. Soon after attachment, the hypoblast splits in the middle, and the cleavage cavity so produced becomes lined by flagellated cells differentiated from the hypoblast (Fig. 12, c, d). This layer of cells is the p
RMREEWD1–. Comparative anatomy. Anatomy, Comparative. COMPARATIVE ANATOMY for digestion; some become protective scales, some are reproductive, some become thirty-foot tentacles armed with powerful nettle cells for defense. Such a colony may contain a thousand individuals, whose differ- ent kinds simulate the differentiated organs of higher forms and help to explain how such organs arose. Each polyp, jellyfish, sea-anemone, or coral, like one of the sponges, possesses a central cavity, the enteron. The body wall is at least two- layered, with an ectoderm on the outside and an endoderm lining the. C. SEC
![. Biology in America. Biology. The Living Machine 307 by appropriate staining, and are connected on the one hand with the tiagella or cilia and on the other with certain deeply staining granules in the body of the animal. To operate on creatures less than 1/150 inch in length is a surgical "stunt" of no small difficulty. Yet this has been done and these delicate fibrils cut, with the resultant cessation of move- ment of the connected fiagella. It is clear then that these fibrils represent a primitive nerve-muscle structure such as occurs in more diff'erentiated form in some of the si Stock Photo](https://c8.alamy.com/comp/RHK7Y8/biology-in-america-biology-the-living-machine-307-by-appropriate-staining-and-are-connected-on-the-one-hand-with-the-tiagella-or-cilia-and-on-the-other-with-certain-deeply-staining-granules-in-the-body-of-the-animal-to-operate-on-creatures-less-than-1150-inch-in-length-is-a-surgical-quotstuntquot-of-no-small-difficulty-yet-this-has-been-done-and-these-delicate-fibrils-cut-with-the-resultant-cessation-of-move-ment-of-the-connected-fiagella-it-is-clear-then-that-these-fibrils-represent-a-primitive-nerve-muscle-structure-such-as-occurs-in-more-differentiated-form-in-some-of-the-si-RHK7Y8.jpg ". Biology in America. Biology. The Living Machine 307 by appropriate staining, and are connected on the one hand with the tiagella or cilia and on the other with certain deeply staining granules in the body of the animal. To operate on creatures less than 1/150 inch in length is a surgical "stunt" of no small difficulty. Yet this has been done and these delicate fibrils cut, with the resultant cessation of move- ment of the connected fiagella. It is clear then that these fibrils represent a primitive nerve-muscle structure such as occurs in more diff'erentiated form in some of the si Stock Photo")
RMRHK7Y8–. Biology in America. Biology. The Living Machine 307 by appropriate staining, and are connected on the one hand with the tiagella or cilia and on the other with certain deeply staining granules in the body of the animal. To operate on creatures less than 1/150 inch in length is a surgical "stunt" of no small difficulty. Yet this has been done and these delicate fibrils cut, with the resultant cessation of move- ment of the connected fiagella. It is clear then that these fibrils represent a primitive nerve-muscle structure such as occurs in more diff'erentiated form in some of the si
RMRGH6CM–. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. BAIRDIELLA CHRYSURA AND ANCHOVIA MITCHILLI. 13 appearance of adult individuals. However, the depth of the body in the thoraxic region is relatively great and the head is relatively large and blunt. They are also somewhat lighter in color. Figure 24 illustrates a young fish 30 mm. in length. The fins are now fully differentiated and the entire surface of the body is covered with scales. However, the scales are still small and deeply embedded in the skin. They are, therefore, not rf<^fe. Fig. 23.—Bairdiella chrysura. Larval fish
RMRE3YFA–. Entomology for medical officers. Insect pests; Insects as carriers of disease. NEMATOCERA: HARMLESS NEMATOCERA 129 has a certain amount of resemblance to a Culicid larva, except that the thorax is not differentiated from the abdomen : it consists of a head with antenna, mandibles, and maxillse, and with mouth-brushes much like those of a Cu/ex larva, and of 12 body-segments ; on the dorsal surface of the penultimate segment of the body there is a pair of breathing- openings like those of Anopheles situated in a depression which is ^mouthhr. T^ni breathing op. ''.rang' 'pseudop. Fig. 34.—Larv
![. Zoology : for students and general readers . Zoology. CHAPTER III. BEANCH III.- -CCELENTEEATA (Hydeoids, Fishes and Polyps). Jelly- â i:/"'. General Characters of Coelenterates.âIn this branch, which is represented by animals hke the Hydra (Fig. 36) and Tuhularia (Fig. 35), the body consists of three cell-layers, surrounding a definite, single, digestive cavity, the mouth of the cavity being surrounded by a circle of tentacles, which are hol- low and connect directly with the stomach. The latter, however, is only partly differentiated or set apart from the body, hence the name Ccelenter Stock Photo](https://c8.alamy.com/comp/RD9KK1/zoology-for-students-and-general-readers-zoology-chapter-iii-beanch-iii-ccelenteeata-hydeoids-fishes-and-polyps-jelly-iquot-general-characters-of-coelenteratesin-this-branch-which-is-represented-by-animals-hke-the-hydra-fig-36-and-tuhularia-fig-35-the-body-consists-of-three-cell-layers-surrounding-a-definite-single-digestive-cavity-the-mouth-of-the-cavity-being-surrounded-by-a-circle-of-tentacles-which-are-hol-low-and-connect-directly-with-the-stomach-the-latter-however-is-only-partly-differentiated-or-set-apart-from-the-body-hence-the-name-ccelenter-RD9KK1.jpg ". Zoology : for students and general readers . Zoology. CHAPTER III. BEANCH III.- -CCELENTEEATA (Hydeoids, Fishes and Polyps). Jelly- â i:/"'. General Characters of Coelenterates.âIn this branch, which is represented by animals hke the Hydra (Fig. 36) and Tuhularia (Fig. 35), the body consists of three cell-layers, surrounding a definite, single, digestive cavity, the mouth of the cavity being surrounded by a circle of tentacles, which are hol- low and connect directly with the stomach. The latter, however, is only partly differentiated or set apart from the body, hence the name Ccelenter Stock Photo")
RMRD9KK1–. Zoology : for students and general readers . Zoology. CHAPTER III. BEANCH III.- -CCELENTEEATA (Hydeoids, Fishes and Polyps). Jelly- â i:/"'. General Characters of Coelenterates.âIn this branch, which is represented by animals hke the Hydra (Fig. 36) and Tuhularia (Fig. 35), the body consists of three cell-layers, surrounding a definite, single, digestive cavity, the mouth of the cavity being surrounded by a circle of tentacles, which are hol- low and connect directly with the stomach. The latter, however, is only partly differentiated or set apart from the body, hence the name Ccelenter
RMRHDPGA–. Bonner zoologische Monographien. Zoology. 102. scales on the upper surface of the tail. Angel (1936) described the subspecies orientalis from the Syrian desert basing the diagnosis on its smaller body size and lower number of dorsal scales. Schmidt (1939) described the subspecies iracensis from Haditha, Iraq, setting it apart for its larger but fewer dorsals, its more pectinate toes, and its different color pattern. After examining the type specimens and other additional material, I have come to the conclusion that orientalis cannot be differentiated from tristrami, but rather, should only b
RMRDYFD9–. A textbook of botany for colleges and universities ... Botany. PTERIDOPHYTES 139 spiral, and every leaf is a sporophyll, either bearing a sporangium or traces of one. In this sense the whole sporophyte body is a strobilus. Each leaf is distincdy differentiated into sporangium and foliage regions (fig- 317)- The foliage portion of the leaf resembles a narrow grass blade, and contains four longitudinal series of air chambers. At the base of this blade, on the adaxial side, the ligule appears, socketed in a small pitiike depression. Below the ligule the sporangium region occurs, the sporangium
RMRJE044–. Cetaceans of the Channel Islands National Marine Sanctuary. Cetacea; Mammals. Pacific White-sided Dolphin Lti^incrhynchus ohliijuiJim Gill, 1865 The Pacific white-sided dolphin is one of the most widely distribut- ed delphinids in the eastern North Pacific and may be the most abundant delphinid in temperate portions of that region. There are two forms or ecotypes: a smaller form found from about the Califor- nia/Mexican border northward and a larger form found from about Point Conception southward. The two can be differentiated only by skeletal features and body proportions.. Please note tha
![. A handbook of cryptogamic botany. Cryptogams. FUNGI 321 homoiomerous. The heteromerous thallus mainly consists of the fungus body of the lichen differentiated into a cortical layer and a medullary layer, the algae occurring either as a definite layer where the cortical and the medullary hyphae join, or they are scattered throughout the medulla, or form a dense mass in it. Such thalli exhibit considerable variety in forms of growth, and are ca].tA foliaceous, fruticose, crustaceans^. Fig. 284.—Roccelld iinctaria DC. A filamentous lichen. Small plant (natural size). &c., in descriptive wo Stock Photo](https://c8.alamy.com/comp/RE3CW3/a-handbook-of-cryptogamic-botany-cryptogams-fungi-321-homoiomerous-the-heteromerous-thallus-mainly-consists-of-the-fungus-body-of-the-lichen-differentiated-into-a-cortical-layer-and-a-medullary-layer-the-algae-occurring-either-as-a-definite-layer-where-the-cortical-and-the-medullary-hyphae-join-or-they-are-scattered-throughout-the-medulla-or-form-a-dense-mass-in-it-such-thalli-exhibit-considerable-variety-in-forms-of-growth-and-are-ca-ta-foliaceous-fruticose-crustaceans-fig-284roccelld-iinctaria-dc-a-filamentous-lichen-small-plant-natural-size-ampc-in-descriptive-wo-RE3CW3.jpg ". A handbook of cryptogamic botany. Cryptogams. FUNGI 321 homoiomerous. The heteromerous thallus mainly consists of the fungus body of the lichen differentiated into a cortical layer and a medullary layer, the algae occurring either as a definite layer where the cortical and the medullary hyphae join, or they are scattered throughout the medulla, or form a dense mass in it. Such thalli exhibit considerable variety in forms of growth, and are ca].tA foliaceous, fruticose, crustaceans^. Fig. 284.—Roccelld iinctaria DC. A filamentous lichen. Small plant (natural size). &c., in descriptive wo Stock Photo")
RMRE3CW3–. A handbook of cryptogamic botany. Cryptogams. FUNGI 321 homoiomerous. The heteromerous thallus mainly consists of the fungus body of the lichen differentiated into a cortical layer and a medullary layer, the algae occurring either as a definite layer where the cortical and the medullary hyphae join, or they are scattered throughout the medulla, or form a dense mass in it. Such thalli exhibit considerable variety in forms of growth, and are ca].tA foliaceous, fruticose, crustaceans^. Fig. 284.—Roccelld iinctaria DC. A filamentous lichen. Small plant (natural size). &c., in descriptive wo
RMRE020A–. Field, forest and farm; things interesting to young nature-lovers, including some matters of moment to gardeners and fruit-growers. Natural history; Agriculture. 272 FIELD, FOREST AND FARM distinct head. In reality it has a head, but so little differentiated from the rest of its body as to give a truncated appearance to the whole. On each side are four feeble legs, and in front a big pair of nippers like those of the crab. Behind is a sort of jointed tail, the terminal joint of which, more swollen than the others, serves as reservoir for the venom. It ends in a hook, very sharp and with a mi
RMRDXRD8–. Plant life, considered with special references to form and function. Plant physiology. CHAPTER I. SINGLE-CELLED PLANTS AND COLONIES. In the lakes and pools, in ditches and slow streams, on the surface of damp rocks and wood, may be found many sorts of microscopic plants, whose entire body is merely a single cell. Blue-green alg^. 11. Fission-algse.—The simplest forms of these, the fission- algce, have the protoplasm only slightly differentiated. The central part becomes the nucleus, while the whole of the remaining protoplasm is colored by the chlorophyll and a blue coloring matter caWed p/i
RMRJE040–. Cetaceans of the Channel Islands National Marine Sanctuary. Cetacea; Mammals. Pacific White-sided Dolphin Lti^incrhynchus ohliijuiJim Gill, 1865 The Pacific white-sided dolphin is one of the most widely distribut- ed delphinids in the eastern North Pacific and may be the most abundant delphinid in temperate portions of that region. There are two forms or ecotypes: a smaller form found from about the Califor- nia/Mexican border northward and a larger form found from about Point Conception southward. The two can be differentiated only by skeletal features and body proportions.. :â ' '...rik''
RMRHMG05–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEROTONIN-LIKE IMMUNOREACTIVITY IN LITTORINA 431. FIGURE 2. Serotonin immunoreactivity of cells in the cerebral ganglia. 2a: Several single cells and cell clusters can be differentiated. These include the anterior medial (AM), the ventral medial (FA/), and the dorsal lateral (DL), clusters. Two particularly prominant, bilaterally symmetrical single cells along the posterior medial margin (small closed arrows) and another pair along the anterior margin (larger open arrows pointing to cell body and axon on right side) also can
RMRE09YY–. Zoology for high schools and colleges. Zoology. THE MITES. 341 pairs of short-clawed feet. Pentastoma (Fig. 309) occurs in the lungs and liver of man, and in horses and sheep. Order 4. Acarina.—Tlie mites are degenerate Arach- nida, the body being oval in form, the head usually small, more or less merged with the thorax, while the latter is not differentiated from the abdomen. There is a slight metamorphosis, the mite when first hatched having but> three pairs of legs, the fourth. Please note that these images are extracted from scanned page images that may have been digitally enhanced fo
RMREF4RA–. A compendium of general botany. Plants. 14 COMPENDIUM OF GENERAL BOTANY. surface in contact with the thin primordial utricle, thus having the appearance of being in contact with the cell-wall. Among the algae the chlorophyll bodies may assume the form of disks, hands, plates, or even radiate like a star. In the Palm,eUacecB (unicellular algae) the plasmic body, with the exception of the nucleus and hj^alo- plasm, is colored j^reen. Among the Phycochromaceoe (nucleus wanting) there are no differentiated chlorophyll bodies, but the entire plasmic body is homogeneously colored. Spiral chlorophy
![. Outlines of plant life : with special reference to form and function . Botany. LIVERWORTS AND MOSSES. 45 (2) The large-celled colorless tissue forming the lower half of section ; the sections oi " leaves " arising near midrib and concave towards center. 54. The shoot.—In the greater number of liverworts the mature vegetative body is a shoot, which is differentiated into stem and leaves (figs. 40, 41). Even in such a body the dorsiventral character is well marked. The stem is slender and bears three (rarely more or fewer) rows of leaves, of which the two dorsal rows are the larger.. Stock Photo](https://c8.alamy.com/comp/RDHBP0/outlines-of-plant-life-with-special-reference-to-form-and-function-botany-liverworts-and-mosses-45-2-the-large-celled-colorless-tissue-forming-the-lower-half-of-section-the-sections-oi-quot-leaves-quot-arising-near-midrib-and-concave-towards-center-54-the-shootin-the-greater-number-of-liverworts-the-mature-vegetative-body-is-a-shoot-which-is-differentiated-into-stem-and-leaves-figs-40-41-even-in-such-a-body-the-dorsiventral-character-is-well-marked-the-stem-is-slender-and-bears-three-rarely-more-or-fewer-rows-of-leaves-of-which-the-two-dorsal-rows-are-the-larger-RDHBP0.jpg ". Outlines of plant life : with special reference to form and function . Botany. LIVERWORTS AND MOSSES. 45 (2) The large-celled colorless tissue forming the lower half of section ; the sections oi " leaves " arising near midrib and concave towards center. 54. The shoot.—In the greater number of liverworts the mature vegetative body is a shoot, which is differentiated into stem and leaves (figs. 40, 41). Even in such a body the dorsiventral character is well marked. The stem is slender and bears three (rarely more or fewer) rows of leaves, of which the two dorsal rows are the larger.. Stock Photo")
RMRDHBP0–. Outlines of plant life : with special reference to form and function . Botany. LIVERWORTS AND MOSSES. 45 (2) The large-celled colorless tissue forming the lower half of section ; the sections oi " leaves " arising near midrib and concave towards center. 54. The shoot.—In the greater number of liverworts the mature vegetative body is a shoot, which is differentiated into stem and leaves (figs. 40, 41). Even in such a body the dorsiventral character is well marked. The stem is slender and bears three (rarely more or fewer) rows of leaves, of which the two dorsal rows are the larger..
RMRDKY6R–. The Cambridge natural history. Zoology. 66 CRUSTACEA COPEPODA chap. parasite. The adult organs now begin to be differentiated, as shown in Fig. 32, 0, from the undifferentiated cellular elements of the N^auplius, the future adult organism being enclosed in a spiny coat from which it escapes. At this stage it occupies a large part of its host's body, lying in the distended ventral blood- vessel, and it escapes to the outside world by rupturing the body- wall of the worm, leaving behind it the second antennae, which have performed their function as a kind of placenta. Malaquin, to whom we owe
RMRH8477–. Botany; principles and problems. Botany. THE TITALLOPIIYTA 2G7 green color which the plant body thus displays has given the class its name. It is well represented in both fresh and salt water and a few species thrive in damp situations on land. The cell is much more highly differentiated here than among the blue-green algae, possessing a nucleus, one or more chloroplasts (often called chromatophores) and usually a sap-cavity, thus resembling in its essential details the cells of the higher plants. Pyrenoids, or centers of starch formation, are prominent in the chloroplasts. The plant body ma
RMRGHEGB–. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. Fig. 69.—Egg showing an early stage in differen- tiation of embryonic axis. Fig. 70.—Egg showing a late stage in differentiation of embryonic axis. ANCHOVIA ARGYROPHANA. When the embryo is fully differentiated, it lies approximately parallel with the major axis of the egg, the head being strongly deflected at the end of the yolk mass. (Fig. 71 and 72.) Larval development.—The newly hatched larvae are approximately 3 mm. in length. The yolk sac remains relatively large and tapers to a point at the posterior end. The body is relativ
![. Bulletin of the Department of Geology of the University of California. Fairbanks.] Geology of Point Sal. 4i ical form is assumed. These peculiar forms are often not sharply differentiated from the structureless basalt. The marked features of the ropy or spheroidal masses are only brought out distinctly where erosive action has been favorable. They vary in size from a few inches up to three feet in diameter. Where the clean sur-. Figure 3.—Spheroidal basalt. faces appear above the reach of the heavy waves, the structure is often apparent. The whole body of a spheroid is in most cases highly a Stock Photo](https://c8.alamy.com/comp/RGHE44/bulletin-of-the-department-of-geology-of-the-university-of-california-fairbanks-geology-of-point-sal-4i-ical-form-is-assumed-these-peculiar-forms-are-often-not-sharply-differentiated-from-the-structureless-basalt-the-marked-features-of-the-ropy-or-spheroidal-masses-are-only-brought-out-distinctly-where-erosive-action-has-been-favorable-they-vary-in-size-from-a-few-inches-up-to-three-feet-in-diameter-where-the-clean-sur-figure-3spheroidal-basalt-faces-appear-above-the-reach-of-the-heavy-waves-the-structure-is-often-apparent-the-whole-body-of-a-spheroid-is-in-most-cases-highly-a-RGHE44.jpg ". Bulletin of the Department of Geology of the University of California. Fairbanks.] Geology of Point Sal. 4i ical form is assumed. These peculiar forms are often not sharply differentiated from the structureless basalt. The marked features of the ropy or spheroidal masses are only brought out distinctly where erosive action has been favorable. They vary in size from a few inches up to three feet in diameter. Where the clean sur-. Figure 3.—Spheroidal basalt. faces appear above the reach of the heavy waves, the structure is often apparent. The whole body of a spheroid is in most cases highly a Stock Photo")
RMRGHE44–. Bulletin of the Department of Geology of the University of California. Fairbanks.] Geology of Point Sal. 4i ical form is assumed. These peculiar forms are often not sharply differentiated from the structureless basalt. The marked features of the ropy or spheroidal masses are only brought out distinctly where erosive action has been favorable. They vary in size from a few inches up to three feet in diameter. Where the clean sur-. Figure 3.—Spheroidal basalt. faces appear above the reach of the heavy waves, the structure is often apparent. The whole body of a spheroid is in most cases highly a
RMRDW68P–. The germ-cell cycle in animals . Cells. GERM-CELL CYCLE IN ANIMALS .Ch - n. N are recognizably concerned with the performance of certain definite functions. The fundamental difference, then, between the one-celled and the many-celled animals is that the differentiated struc- tures in the former are not separated from one another by cell walls as in multicellular organisms. Whether all,Protozoa possess a body which can be considered as specialized and set aside for reproduc- tion purposes, as the germ- plasm theory requires, is a question upon which author- ities differ. In certain cases it s
RMREXDTF–. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 19.—Section of skin of Protopterus. c, corium; e, epidermis; g, multicellular gland; u, unicellular gland. thys. There is an involution of cells of the Malpighian layer into the corium, where they become cut off from their point of origin, and are differentiated into a deeper glandular layer and an outer rounded body, the lens (fig. 21). Around this the corium forms a reflecting layer. FlG. 20.—A, head of Noturus flavus; B, section of poison gland of Schilbeodes miurus (after Reed), e, epidermis; p, pore o
RMRE081W–. A text-book of invertebrate morphology. Invertebrates. TYPE ANNELIDA. 205 cations of the cirri or brandies arising from them, and respiratory in function, also occur. Muscles pass from the body-wall to the parapodia, which thus become important organs of locomo- tion and in some of the actively swim- ming species assume a more or less flattened plate-like form. The head segment is generally well differentiated from those which succeed it, being destitute of parapodia and setsB, and as a rule carrying a number of appendages sensory in function, and being likewise usually provided with ^^ eyes
![. Bulletin - United States National Museum. Science. 158 BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM Color.—Body greenish yellow, opaque, with spots of dark green- ish blue on the front and sides of the head, and a row along either side of the thorax in the grooves between the segments; tips of the first antennae reddish. Blue, violet, brown, yellow, red, and green pigments are scattered in varying proportions and intensities through the body and the appendages. Often these colors are sharply differentiated and give the copepod an unusually gaudy appearance. Traces of these col- ors are Stock Photo](https://c8.alamy.com/comp/RG7MK3/bulletin-united-states-national-museum-science-158-bulletinquot-15-8-united-states-national-museum-colorbody-greenish-yellow-opaque-with-spots-of-dark-green-ish-blue-on-the-front-and-sides-of-the-head-and-a-row-along-either-side-of-the-thorax-in-the-grooves-between-the-segments-tips-of-the-first-antennae-reddish-blue-violet-brown-yellow-red-and-green-pigments-are-scattered-in-varying-proportions-and-intensities-through-the-body-and-the-appendages-often-these-colors-are-sharply-differentiated-and-give-the-copepod-an-unusually-gaudy-appearance-traces-of-these-col-ors-are-RG7MK3.jpg ". Bulletin - United States National Museum. Science. 158 BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM Color.—Body greenish yellow, opaque, with spots of dark green- ish blue on the front and sides of the head, and a row along either side of the thorax in the grooves between the segments; tips of the first antennae reddish. Blue, violet, brown, yellow, red, and green pigments are scattered in varying proportions and intensities through the body and the appendages. Often these colors are sharply differentiated and give the copepod an unusually gaudy appearance. Traces of these col- ors are Stock Photo")
RMRG7MK3–. Bulletin - United States National Museum. Science. 158 BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM Color.—Body greenish yellow, opaque, with spots of dark green- ish blue on the front and sides of the head, and a row along either side of the thorax in the grooves between the segments; tips of the first antennae reddish. Blue, violet, brown, yellow, red, and green pigments are scattered in varying proportions and intensities through the body and the appendages. Often these colors are sharply differentiated and give the copepod an unusually gaudy appearance. Traces of these col- ors are
RMRFRR70–. Carnegie Institution of Washington publication. -e'tk.pig. '. fis. did. FH;. 61. Two Vertical Sections of Eye of Individual about 5 mm. long. Fig. a taken through Lens, Vitreous Cavity, and Choroid Fissure. Fig. 6, Second Section Proximal to that from which lig. 61 a was drawn and through Innermost Part of Vitreous Body. Layers of Retina have not yet hegun to be differentiated. It is differentiated into a nuclear layer (the outer and inner together) and the .nanglionic layer, separated by the incomplete inner reticular layer. The ganglionic layer is composed of two sorts of cells. Those near
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