THE P^DOGENETIC FLY, MIASTOR 55 



(f.n) are produced. The nucleus of the polar body 

 divides by mitosis and the two nuclei thus formed 



Fig. 14. — Miastor americana. Longitudinal section through mature 

 egg. c = cytoplasm; /.n = female nucleus; w.c = nurse chamber; 

 p.h = polar bodies; pPl = pole-plasm. 



remain within the egg substance near the periphery 

 for a considerable period (Fig. 14), but finally 



