No. 2.] THE EGG OF BUFO LENTIGINOSUS. 337 



19. The barrel-shaped segmentation spindle is formed primarily by the 



meeting of some of the rays which are again sent out by the 

 astrospheres. 



20. When cell division occurs, the rays of the asttospheres again disappear. 



The astrospheres become much smaller, but do not disappear entirely 

 at any stage. 



21. The astrospheres of the chromatin rings, of the first polar spindle and 



of the segmentation spindle do not contain a centriole at any period 

 of their history. 



22. Polyspermy is not normal in the tgg of Bufo lentiginosus. 



