Fig. 24. Fertilization of the Egg of the Nematode 

 WottM Ascaris megalocephala; '^N, egg nucleus; (JJV, sperm 

 nucleus; Arch, archiplasm ; G, centrosome; A, B, approach of 

 germ nuclei; 0, D, formation of two chromosomes in each 

 germ nucleus; E, F, stages in the division of the chromosomes 

 which are split in E and are separating in F; only three 

 chromosomes are shown in F. (From Wilson after Boveri.) 



