44 



normal conditions, the capsule is usually applied to the shell 

 of the egg and the nuclear cup is directed away from the egg. 

 In this position eversion takes place and the ejected central 

 hody, the inner tubule and the capsule with its contents are 

 thus turned through the shell into the egg. 



9. The nuclear cup is left on the outside of the egg 

 and it soon falls off. 



10. The wall of the capsule together with its everted 

 contents, which we now call the sperm- vesicle, sinks into 

 the cytoplams of the egg^ where it is enlarged and transform- 

 ed into the male pronucleus. 



11. The contents of the capsule may he derived from 

 the nucleus of the spermatid and is prohahly oxychromatin 

 which deposits hasichromatin after it enters the egg and so 

 gives rise to the chromosomes in the male pronucleus. 



