262 



GERM-CELL CYCLE IN ANIMALS 



Onco/betCcuf 3 





A'— 



A 



'4 



Jik 



^ >• 



ir- 



\ •••• 



Onc4ypetCu9 9 



Fig. 67. — Maturation in Oncoveltus. Male above. Female below. 

 Lettering as in Fig. 65. {From Morgan's Heredity and Sex, pub- 

 lished by the Columbia University Press.) 



