64 



GERM-CELL CYCLE IN ANIMALS 



22 



00 c 



24 



Fig. 22. — Miastor americana. 



of embryo showing oogonia 

 Fig. 23. — Miastor americana. 



one dividing by mitosis (o). 

 Fig. 24. — Miastor americana. 



{o6(ji). m = mesoderm. 

 Fig. 25. — Miastor americana. 



(n.c). 



Frontal section through posterior end 

 Koogs) formmg two rows of four each. 

 Ovary containing sixteen oogonia (odgi), 



m = mesoderm. 



Ovary containing thirty-two oogonia 



Young oocyte {ooc) with nurse cells 



