PLATE 7 



EXPLANATION OF FIGURES 



62 An oocyte in the early growth phase, showing the vitelline body in the 

 form of a spindle. 



63 Section through an adult testis, showing an oocyte among the numerous 

 cysts (not filled in). 



64 Section through a cell nest containing one growing oocyte among numerous 

 smaller germ cells. 



65 Section of a degenerating cyst, with germ cells in various stages of dis- 

 integration. 



140 



