. The cell in development and inheritance. Cells; Cells. C ^ I Fig. 62. — Formation of the spermatozoon from the spermatid. A. Late stage of spermatid of the shark Scyllium. [MoORE.] B. Spermatid of starfish Chcetaster. [FIELD.] C. Spermatid of butterfly Pygcsra. D. Young spermatozoon of the same. [PLATNER.] a. apical body; axial filament; c. "centrosome;" e. envelope of tail; m. middle-piece (" small mitosoma" of Platner) ; n. nucleus ; p. paranucleus (" Nebenkern," or " large mitosoma" of Platner). done, yet there is good reason to believe that bo
. The cell in development and inheritance. Cells; Cells. C ^ I Fig. 62. — Formation of the spermatozoon from the spermatid. A. Late stage of spermatid of the shark Scyllium. [MoORE.] B. Spermatid of starfish Chcetaster. [FIELD.] C. Spermatid of butterfly Pygcsra. D. Young spermatozoon of the same. [PLATNER.] a. apical body; axial filament; c. "centrosome;" e. envelope of tail; m. middle-piece (" small mitosoma" of Platner) ; n. nucleus ; p. paranucleus (" Nebenkern," or " large mitosoma" of Platner). done, yet there is good reason to believe that both these observers are in error, since their results are contradicted by the history of the spermatozoon in fertilization. As regards the insects, Henking's observations on the fertilization of the butterfly Pieris leave little doubt that the sperm-centrosome is here derived from the middle- piece; and, moreover, in the grasshopper Calopteniis, Wilcox ('95) has traced the centrosome of the spermatid into the middle-piece. In the case of echinoderms, Boveri, Mathews, and myself, confirmed by several later observers, have independently traced the sperm-centro- some to the middle-piece during fertilization, and have shown that. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York : The Macmillan company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcells, bookyear1896
