Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Томи 41 – 42The Society, 1902 |
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Сторінка 43
... cell lineage of a brachiopod , he graciously offered me the material which he had collected with the request that I ... cells and nuclei , has been faithfully preserved , every trace of the cilia , which according to Morse ( '71 -'73 ) ...
... cell lineage of a brachiopod , he graciously offered me the material which he had collected with the request that I ... cells and nuclei , has been faithfully preserved , every trace of the cilia , which according to Morse ( '71 -'73 ) ...
Сторінка 45
... cell stage , and in some eggs they appear to pass into the cleavage cavity , though in such cases it is difficult to distinguish between polar bodies and small spherules which are cut off from the inner ends of the cleavage cells , and ...
... cell stage , and in some eggs they appear to pass into the cleavage cavity , though in such cases it is difficult to distinguish between polar bodies and small spherules which are cut off from the inner ends of the cleavage cells , and ...
Сторінка 46
... cells , usually at the animal pole ( Fig . 8 ) . Later stages in which one or two of the blastomeres are much larger ... cells are of equal size , by the more rapid division of these larger blastomeres . The eight - cell stage gives rise ...
... cells , usually at the animal pole ( Fig . 8 ) . Later stages in which one or two of the blastomeres are much larger ... cells are of equal size , by the more rapid division of these larger blastomeres . The eight - cell stage gives rise ...
Сторінка 47
... cells . I have found it quite impossible to distinguish any difference between the cells which invaginate and those which do not until after the gastrulation is well advanced . III . GASTRULATION AND FORMATION OF BODY LAYERS AND ...
... cells . I have found it quite impossible to distinguish any difference between the cells which invaginate and those which do not until after the gastrulation is well advanced . III . GASTRULATION AND FORMATION OF BODY LAYERS AND ...
Сторінка 48
is always but one cell thick ( Figs . 40-42 ) , though in the earlier stages of its development it represents a fold in the wall of the archenteron ( Figs . 42a - 426 ) . The backward growth of this par- tition wall continues until the ...
is always but one cell thick ( Figs . 40-42 ) , though in the earlier stages of its development it represents a fold in the wall of the archenteron ( Figs . 42a - 426 ) . The backward growth of this par- tition wall continues until the ...
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Africa AMER AMERICAN PHILOSOPHICAL SOCIETY animals appear April Asia Australia auta autic beds belong blastopore body brachiopods Cambaroides Cambarus canals cells Central chromosomes cœlom connection contains crude oil Crustacea crystals curves Decapods deposits distillates distribution division domeykite drones eggs enteron Eocene equation evidence existence fact fauna Feb'y fertilization follicle formation forms fossils freshwater genera genus geographer geological Greater Antilles hydrocarbons islands Jan'y Jurassic land larva larvæ later Lower Cretaceous male mantle mass Mesozoic method Mexico Miocene nature Noctua North northern nuclei observed Ocean Oligocene origin parthenogenesis Pennsylvania petroleum Philadelphia PHILOS plate Pliocene polar body posterior Potamobius present probably PROC produced Prof queen region relation represented river sandstones separated shown solution South America southern species spermatocyte spermatogonia spermatozoa stage Terebratulina Tertiary theory tion Upper Cretaceous Zool