64 



GERM-CELL CYCLE IN ANIMALS 



22 



25 



FIG. 22. Miastor americana. Frontal section through posterior end 



of embryo showing oogonia (oog 3 ) 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 



(ooys). m = mesoderm. 



FIG. 25. Miastor americana. Young oocyte (ooc) with nurse cells 



(n.c). 



