64 



GERM-CELL CYCLE IN ANIMALS 



22 



tLC 



00 C 



24 



Fig. 22. — Miastor americana. Frontal section through posterior end 



of embryo showing oogonia (oogs) forming two rows of four each. 



Fig. 23. — Miastor americana. Ovary containing sixteen oogonia (00(74), 



one dividing by mitosis (a), m = mesoderm. 



Fig. 24. — Miastor americana. Ovary containing thirty-two oogonia 



(ooQi,). m = mesoderm. 



Fig. 25. — Miastor americana. Young oocyte {ode) with nurse cells 



in.c). 



