32 



KARYOKINESIS. 



a /9 Ck - 



$h on 



Figs. V-X.— Independence of the Germ Nuclei of Crepidula.— The duality of each nucleus is shown 

 in the metaphase and telophase of the first cleavage (figs. V, VI), in the prophase and telophase of the 

 second cleavage (figs. VII, VIII, X) and in an abnormal egg (fig. IX). 



