STUDIES ON GERM CELLS 



ROBERT W. HEGNER 



PLATE lU 



72 



71 



65 Part of posterior end of oocyte from 

 position 65 in figure 9. 



66 Part of posterior end of egg shortly 

 before ready to lay. 



67 Nuclear division among nurse cells. 



68 Spermatogonia (spg), cells from ter- 

 minal cap (t.c) and epithelial cells (ep). 



69 Mitotic division of spermatogonium. 



70 Later stage of same process. 



74 



71 Binuclcated spermatogonial cell 

 within epithelial envelope. 



72 Four spermatogonia connected by 

 spindle remains. 



73 Spermatogonia from a cyst contain- 

 ing eight cells. 



74 Section through a cyst containing 

 32 spermatogonia. 



509 



