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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)

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:
Author Edwing Grant Conklin after F. R. Lillie
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Public domain
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, 1924.

Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. PD-1923Public domain in the United States//

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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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