THE P^EDOGENETIC FLY, MIASTOR 55 



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

 divides by mitosis and the two nuclei thus formed 



pPl 



FIG. 14. Miastor americana. Longitudinal section through mature 

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

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



remain within the egg substance near the periphery 

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



