Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Томи 41 – 42The Society, 1902 |
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Сторінка 51
... land- marks have appeared by which its position relative to definitive organs could be determined , as well as the fact that both the oral and aboral sides of the embryo are very similar , has been chiefly responsible for this ...
... land- marks have appeared by which its position relative to definitive organs could be determined , as well as the fact that both the oral and aboral sides of the embryo are very similar , has been chiefly responsible for this ...
Сторінка 81
... land Isopods in the vicinity of Philadelphia commence to breed . The breeding season continues during the summer months . There are , in a single year , several cycles of development of the reproductive elements ; the exact number I ...
... land Isopods in the vicinity of Philadelphia commence to breed . The breeding season continues during the summer months . There are , in a single year , several cycles of development of the reproductive elements ; the exact number I ...
Сторінка 100
... land Isopods in other structural peculiarities to be regarded as more specialized than Asellus , but the sperm colony itself in Asellus is less compact and less completely developed as a unit . The obscurity of this point serves to ...
... land Isopods in other structural peculiarities to be regarded as more specialized than Asellus , but the sperm colony itself in Asellus is less compact and less completely developed as a unit . The obscurity of this point serves to ...
Сторінка 124
... land - tortoises , while these if not entirely absent are conspicuously rare in the sandstones , while the few examples of Trionyx , an aquatic turtle , have , in so far as I know , all been recovered from the sandstones ? I have myself ...
... land - tortoises , while these if not entirely absent are conspicuously rare in the sandstones , while the few examples of Trionyx , an aquatic turtle , have , in so far as I know , all been recovered from the sandstones ? I have myself ...
Сторінка 127
... land - tortoises in the clays and their almost complete absence in the sandstones is very strong if not positive evidence that the former were not deposited in the bottom of a great lake , for I do not believe that any one will assume ...
... land - tortoises in the clays and their almost complete absence in the sandstones is very strong if not positive evidence that the former were not deposited in the bottom of a great lake , for I do not believe that any one will assume ...
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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