. The cell in development and inheritance. Cells. Fig. 1^8. — Fertilization of the egg of the parasitic annelid Myzostoma. [WHEELER.] A. Soon after entrance of tlie spermatozoon; the sperm-nucleus at J ; at ? the germinal vesicle ; at c the double egg-centrosome. B. First polar body forming at ? ; n, the cast-out nucle- olus or germinal spot. C. The polar bodies formed {) ; germ-nuclei of equal size; at c the persistent egg-centrosomes. D. Approach of the germ-nuclei; the egg-amphiaster formed. In all other known cases this amphiaster is derived from the jr/t'r;«-amphiaster. Serious doubt h
. The cell in development and inheritance. Cells. Fig. 1^8. — Fertilization of the egg of the parasitic annelid Myzostoma. [WHEELER.] A. Soon after entrance of tlie spermatozoon; the sperm-nucleus at J ; at ? the germinal vesicle ; at c the double egg-centrosome. B. First polar body forming at ? ; n, the cast-out nucle- olus or germinal spot. C. The polar bodies formed {) ; germ-nuclei of equal size; at c the persistent egg-centrosomes. D. Approach of the germ-nuclei; the egg-amphiaster formed. In all other known cases this amphiaster is derived from the jr/t'r;«-amphiaster. Serious doubt has also been thrown on Conklin's conclusions by subsequent research. Kostanecki and Wierzejski ('96) have recently made a very thorough study, by means of serial sections, of the fertil-. 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
