Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Томи 41 – 42The Society, 1902 |
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Сторінка 48
... direction and elongated antero- posteriorly . The blastopore is at first a circular opening ; it then becomes narrowed from side to side and apparently elongated antero - posteriorly ( Figs . 17-21 ) . The blastopore groove thus formed ...
... direction and elongated antero- posteriorly . The blastopore is at first a circular opening ; it then becomes narrowed from side to side and apparently elongated antero - posteriorly ( Figs . 17-21 ) . The blastopore groove thus formed ...
Сторінка 49
... direction and enlarged in its other axes . Associated with the growth of the enterocoel is an important change in the character of its bounding cells ; at first they form a quite regular , cuboid or columnar epithelium ( Figs . 14-16 ...
... direction and enlarged in its other axes . Associated with the growth of the enterocoel is an important change in the character of its bounding cells ; at first they form a quite regular , cuboid or columnar epithelium ( Figs . 14-16 ...
Сторінка 56
... direction ( Figs . 33 , 35 , 56-60 ) . In the oldest stages which I have observed a diverticulum from the anterior end of the enteron grows out toward the ventral side , and at the same time an invagi- nation of the ectoderm appears in ...
... direction ( Figs . 33 , 35 , 56-60 ) . In the oldest stages which I have observed a diverticulum from the anterior end of the enteron grows out toward the ventral side , and at the same time an invagi- nation of the ectoderm appears in ...
Сторінка 114
... direction almost at right angles to the present courses of the Cheyenne and White Rivers, now the two principal streams of this immediate region. On the same horizon with the Protoceras sandstones and contemporaneous with them in origin ...
... direction almost at right angles to the present courses of the Cheyenne and White Rivers, now the two principal streams of this immediate region. On the same horizon with the Protoceras sandstones and contemporaneous with them in origin ...
Сторінка 114
... direction almost at right angles to the present courses of the Cheyenne and White Rivers , now the two principal streams of this immediate region . On the same horizon with the Protoceras sandstones and contemporaneous with them in ...
... direction almost at right angles to the present courses of the Cheyenne and White Rivers , now the two principal streams of this immediate region . On the same horizon with the Protoceras sandstones and contemporaneous with them in ...
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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