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FIG. 14 

 The eggs of a worm Thalassema (A) and of a sea-urchin Toxopneustes (R) at the 

 time of fertilization. In A the sperm is seen near s, while near p the formation 

 of the polar bodies is in progress. In B, the sperm is seen above, near c.c, about 

 three minutes after its penetration into the egg, and the egg-nuoleus below. 



