Ked.S 



Fig. n. 



Diagram of the formation of ova in ^scan's megalocephala, var. 

 bivalens. A. The primitive germ-cell. B. Fully developed germ- 

 mother-cell, with chromosomes doubled. C. The first nuclear division. 

 ]). One daughter-cell (oocyte) extnided as the first polar body. E. The 

 second or reducing division ; the retained, and the extruded oocyte, 

 dividing, and forming four grand-daughter cells (oozoa). F. The ripe 

 ^gS"C^l^ the functional oozoon ; the other oozoa, 2, 3, and 4, being 

 the polar bodies. 



