CYTOPLASMIC INCLUSIONS OF THE GERM-CELLS 287 
becomes cone-shaped, and later flattened and crescentie in 
shape when the broad side of the sperm is examined. In the 
fully formed acrosome the outer zone of the acrosome is much 
ereater in extent than the inner zone of the acrosome. 
ss 
& 
> 
17. 
13. BrBLioGRAPHY. 
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. Doncaster and Cannon.—‘‘ The Spermatogenesis of the Louse ”’, 
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“The Cytoplasmic Inclusions of the Germ-Cells. Part II, Helix 
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“ Part III, Notes on the Dimorphic Spermatozoa of Paludina ”’, 
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