604 
J. BRONTE GATENBY. 
Text-fig. 5. 
Scheme showing generations of spermatogonia ( S.P . 1, 2, and 3). At 
X. generation 2 and 3 are interconnecting, at Y. are the much 
divided, small spermatogonia. The four small cells to the right of 
the spermatogonial generations are spermatids. Below are the 
derivations of egg, yolk cell, and follicle cell from the germinal 
epithelium ( G.E . ). 
