Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Томи 41 – 42The Society, 1902 |
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Сторінка 65
... closely related . ' On the other hand , according to Masterman's ( '97 and 1900 ) recent work on Actinotrocha , there are certain important respects in which Actinotrocha differs decidedly from the brachiopod larva : ( 1 ) The cœlom ...
... closely related . ' On the other hand , according to Masterman's ( '97 and 1900 ) recent work on Actinotrocha , there are certain important respects in which Actinotrocha differs decidedly from the brachiopod larva : ( 1 ) The cœlom ...
Сторінка 67
... closely Vermes , sedentary annelids and Gephyreans . Kowalevsky also names a considerable number of points in which brachiopods resemble chatopods . Some of these features are not actually characteristic of the brachiopods , as , for ...
... closely Vermes , sedentary annelids and Gephyreans . Kowalevsky also names a considerable number of points in which brachiopods resemble chatopods . Some of these features are not actually characteristic of the brachiopods , as , for ...
Сторінка 78
... closely crowded granules . Between these are sometimes other granules , which with the iron hæmatoxylin stain are less deeply colored , and with Bordeaux red and Delafield's hæmatoxylin take a red tint . The periphery of the latter is ...
... closely crowded granules . Between these are sometimes other granules , which with the iron hæmatoxylin stain are less deeply colored , and with Bordeaux red and Delafield's hæmatoxylin take a red tint . The periphery of the latter is ...
Сторінка 84
... closely . The number , however , is certainly less than that present in the spermatogonia and not greater than sixteen ( Fig . 26 ) . The reduction in the number of chromosomes , therefore , apparently takes place at this stage , and ...
... closely . The number , however , is certainly less than that present in the spermatogonia and not greater than sixteen ( Fig . 26 ) . The reduction in the number of chromosomes , therefore , apparently takes place at this stage , and ...
Сторінка 89
... closely crowded together the nucleus is often seen to be bent or coiled upon itself ( Fig . 83 ) . There is at first a small quantity of cytoplasm around the nuclei , but as they increase in length this disappears . The cytoplasmic ...
... closely crowded together the nucleus is often seen to be bent or coiled upon itself ( Fig . 83 ) . There is at first a small quantity of cytoplasm around the nuclei , but as they increase in length this disappears . The cytoplasmic ...
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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