18 



TEXT-BOOK OF EMBRYOLOGY. 



(Fig. 9, /, / and K). The somatic number of chromosomes has been reduced 

 one-half, and the egg nucleus jemale pronucleus is ready for union with the 

 sperm nucleus male pronucleus. 



Since the chromatin rods left after the formation of the polar bodies are 



FIG. 9- Maturation of the ovum of Ascaris megalocephala (bivalens) Boveri Wil A 



"Tads- f&StthflfSSf 5 W*-*"? ' F ' ;St P'" A formed, SnTa ntag 



^^^ 



