Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Томи 41 – 42The Society, 1902 |
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Сторінка 37
... Formation , ' by Prof. W. B. Scott , for Dr. H. von Ihering , of São Paulo , Brazil . " A Comparison between the Ancient and Recent Mollus can Fauna of New England , " by Prof. Edward S. Morse , of Salem , Mass . " Distribution of Fresh ...
... Formation , ' by Prof. W. B. Scott , for Dr. H. von Ihering , of São Paulo , Brazil . " A Comparison between the Ancient and Recent Mollus can Fauna of New England , " by Prof. Edward S. Morse , of Salem , Mass . " Distribution of Fresh ...
Сторінка 45
... formation of eight blasto- meres , all of which are nearly equal in size ( Figs . 5 , 6 , 7 ) ; in some eggs the four cells at the animal pole lie just above those at the vegetal pole ( Fig . 6 ) ; in others they have rotated through ...
... formation of eight blasto- meres , all of which are nearly equal in size ( Figs . 5 , 6 , 7 ) ; in some eggs the four cells at the animal pole lie just above those at the vegetal pole ( Fig . 6 ) ; in others they have rotated through ...
Сторінка 47
... FORMATION OF BODY LAYERS AND CAVITIES . Gastrulation occurs by typical invagination , and at the time when the infolding begins there is no difference in the cells at the two poles ( Figs . 13 and 37 ) . The infolding continues until ...
... FORMATION OF BODY LAYERS AND CAVITIES . Gastrulation occurs by typical invagination , and at the time when the infolding begins there is no difference in the cells at the two poles ( Figs . 13 and 37 ) . The infolding continues until ...
Сторінка 49
... formation of body cavities in brachiopods has been observed heretofore only by Kowalevsky . A comparison of the method of gastrulation and cœlom formation in Terebratu- lina with Kowalevsky's observations on Cistella and other brachio ...
... formation of body cavities in brachiopods has been observed heretofore only by Kowalevsky . A comparison of the method of gastrulation and cœlom formation in Terebratu- lina with Kowalevsky's observations on Cistella and other brachio ...
Сторінка 50
... formation of the cœlom it would be well to know that they actually exist , and it seems highly desirable that the embryology of Cistella should be reinvestigated with the aid of modern histological methods . The differences between ...
... formation of the cœlom it would be well to know that they actually exist , and it seems highly desirable that the embryology of Cistella should be reinvestigated with the aid of modern histological methods . The differences between ...
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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