Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Томи 41 – 42The Society, 1902 |
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Сторінка 51
... known that previous investigators of the embryology of the brachiopods have found the proper orientation of the embryo one of their most perplexing problems . The complete closure of the blastopore at a relatively early stage and before ...
... known that previous investigators of the embryology of the brachiopods have found the proper orientation of the embryo one of their most perplexing problems . The complete closure of the blastopore at a relatively early stage and before ...
Сторінка 58
... known that in a great many annelids and leeches and in all groups of mollusks except the cephalopods the cleavage is of a certain determinate or morphogenetic ( Child , 1900 ) type . The principal characteristics of this type of ...
... known that in a great many annelids and leeches and in all groups of mollusks except the cephalopods the cleavage is of a certain determinate or morphogenetic ( Child , 1900 ) type . The principal characteristics of this type of ...
Сторінка 63
... known , and I have observed the beginnings of such a nervous system in the larva of Terebratulina ; I have also observed ( p . 55 ) the apical plate and ganglion ( 12 ) and the ventral plate and ganglion ( 13 ) in Terebratulina ; only ...
... known , and I have observed the beginnings of such a nervous system in the larva of Terebratulina ; I have also observed ( p . 55 ) the apical plate and ganglion ( 12 ) and the ventral plate and ganglion ( 13 ) in Terebratulina ; only ...
Сторінка 69
... known , the anus opens near the mouth and on the left side ; in Crania it is terminal in position , and the embryology of either of these forms should throw light on this question as to the mor phological position and homologies of the ...
... known , the anus opens near the mouth and on the left side ; in Crania it is terminal in position , and the embryology of either of these forms should throw light on this question as to the mor phological position and homologies of the ...
Сторінка 114
... known as the Metamynodon sandstones. These sandstones are faunally distinct from the surrounding clays. At the top of the Oreodon beds in the same region, these sandstone lenses are replaced by a second series very similar ...
... known as the Metamynodon sandstones. These sandstones are faunally distinct from the surrounding clays. At the top of the Oreodon beds in the same region, these sandstone lenses are replaced by a second series very similar ...
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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