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. 



Fig. 20. — Miastor americana. Longitudinal section through an egg 

 with eight oogonia {oogz). cR = chromatin remains. 



Fig. 21. — Miastor americana. Sagittal section through embryo show- 

 ing oogonia iodg-^) near end of tail fold. 



