284 GERM-CELL CYCLE IN ANIMALS 



the male germ-cell cycle, especially in mammals, 

 mollusks, and insects, and appear to be continuous 

 from one generation of cells to the next. During 



FIG. 79. Behavior of the mitochondria during the fertilization and 

 early cleavage of the egg of Ascaris. A. Egg into which a sperma- 

 tozoon has penetrated. B, C. The mixing of the mitochondria of 

 the egg and spermatozoon. D. Division stage of the first two blas- 

 tomeres. (After Meves, 1911 and 1914.) 



mitosis the plastosomes lie outside of the spindle 

 (Fig. 79, D) ; they may divide autonomously as 

 claimed by Faure-Fremiet (1910) in PROTOZOA (Fig. 



