DEVELOPMENT OF PARACOPIDOSOMOPSIS 



23 



fact, then obviously a given embryo does not originate from two 

 kinds of cells, one of which is derived from predestined germ cells. 

 The best that can be said for the similarity in the distribution of 

 the nucleolus in the monembryonic and polyembryonic eggs 



Text fig. 2 Diagram showing the distribution of the nucleolus up to the 

 twenty-eight-celled stage. 



is, that while the latter has inherited this condition from the 

 former, the nucleolus has ceased to function as a germ-line 

 determinant, owing to the increase in complexity of development 

 in the polyembryonic egg. 



