29 



STRUCTURE AND FUNCTION IN MAMMALIAN EGGS 



or the female pronucleus that is the larger. In the spiny antcatcr 

 Echidna, the opossum Didelphis. the native cat Dasyurus, the wallaby 

 Setonix, the armadillo (Fig. 23), the bat, the ferret, the pig, the 

 golden hamster (Fig. 22), the field vole (Fig. 24), and man (Hvatov, 



Fig. 22 

 Pronuclei of the Libyan jird (above) and golden hamster (below). X 1,200. 



Fig. 23 

 Pronuclei of the armadillo Dasypus 

 novemdnctus. (Drawn from an illustration 

 by Newman, 1912, which was based on 

 sections passing through the animal pole 

 of the egg.) 



