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File:PSM V84 D531 Facts and factors of development fig3-5.jpg

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Fig. 3. Entire spermatozoon of the annelid nereis, showing perforatorium (P); head (H); middle piece (M), and tail (T). (From F. R. Lillie)
Figs. 4-5. Two stages in the entrance of the spermatozoon into the egg of nereis. Some of the protoplasm of the egg has gathered at the point of entrance to form the entrance cone (EX) which, together with the sperm head, moves into the interior of the egg in the later stages. The black spheres represent yolk. (From F. R. Lillie)

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Source Edwin Grant Conklin: Facts and factors of development. The Popular science monthly, Volume 84, p527. New York, Popular Science Pub. Co., June 1914. Online: archive.org.
Author Edwing Grant Conklin after F. R. Lillie
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image extraction process This file has been extracted from another file: Popular Science Monthly Volume 84.djvu
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1923.

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current07:39, 22 March 2018Thumbnail for version as of 07:39, 22 March 2018486 × 768 (51 KB)Ineuw (talk | contribs)Cleaned image, enhanced contrast
02:50, 19 March 2011Thumbnail for version as of 02:50, 19 March 20111,700 × 2,306 (320 KB)Martin H. (talk | contribs)
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