Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Томи 41 – 42The Society, 1902 |
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Сторінка 42
... eggs and embryos of the form studied ( Terebratulina sep- tentrionalis ) are quite small and opaque . Nevertheless Morse's work stands to - day as one of the two most important works on the embryology of the brachiopods . The other work ...
... eggs and embryos of the form studied ( Terebratulina sep- tentrionalis ) are quite small and opaque . Nevertheless Morse's work stands to - day as one of the two most important works on the embryology of the brachiopods . The other work ...
Сторінка 43
... eggs were quite opaque and , except in a few cases , it was impossible to render the nuclei visible in preparations of the entire egg ; the cleavage was almost entirely equal and I was unable to find any constant landmarks which might ...
... eggs were quite opaque and , except in a few cases , it was impossible to render the nuclei visible in preparations of the entire egg ; the cleavage was almost entirely equal and I was unable to find any constant landmarks which might ...
Сторінка 44
... EGG AND ITS CLEAVAGE . Morse ( '71 ) has described the method of egg laying , and has called attention to the fact that the mature eggs are usually kidney- shaped , though they vary considerably in shape and size . None of the unsegmented ...
... EGG AND ITS CLEAVAGE . Morse ( '71 ) has described the method of egg laying , and has called attention to the fact that the mature eggs are usually kidney- shaped , though they vary considerably in shape and size . None of the unsegmented ...
Сторінка 45
... egg after the sixteen - cell stage , and in some eggs they appear to pass into the cleavage cavity , though in such cases it is difficult to distinguish between polar bodies and small spherules which are cut off from the inner ends of ...
... egg after the sixteen - cell stage , and in some eggs they appear to pass into the cleavage cavity , though in such cases it is difficult to distinguish between polar bodies and small spherules which are cut off from the inner ends of ...
Сторінка 46
... eggs represented in Fig . 12 about forty - eight cells are present and some of these are larger than others , indicating that with them division has been delayed . The egg shown in Fig . 12 has been flattened by the cover glass , so ...
... eggs represented in Fig . 12 about forty - eight cells are present and some of these are larger than others , indicating that with them division has been delayed . The egg shown in Fig . 12 has been flattened by the cover glass , so ...
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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