62 GERM-CELL CYCLE IN ANIMALS 



Even under the lower powers of the compound micro- 

 scope the germ cells stand out with great distinct- 

 ness and could not possibly be confused with any 

 other cells in the embryo. 



20 



FIG. 20. Miastor americana. Longitudinal section through an egg 

 with eight oogonia (oogy). cR = chromatin remains. 



FIG. 21. Miastor americana. Sagittal section through embryo show- 

 ing oogonia (oog$) near end of tail fold. 



