SPERMATOGENESIS 

 Alice M. Boring 



Vff yw) 



62 



68 



64 



65 



66 



PLATE ni 



67 



81 



m. 



8 2 



72 



78 



73 



79 



83 



84 



83 



92 



98 



93 



99 





88 



94 



100 



89 



ifc-i* 



95 



JOl 



MEMBRACID.* 



The JounxAL of Experimental Zoology, vol. iv, no. 4 



90 



96 



102 



91 



97 



103 

 A. M. B. del. 



