Plate XIV 



, 



* 



,-- T 



(4) 



a 



*** 



V*. 



(6) 



(7) 



(*) (9) (10) 



Spermatogenesis of the Hornet (after MEVKS, from the Author's Determination 

 of Sex), (i) Sperm mother-cell. (2-6) Abortive division of the nucleus, 

 resulting in the separation of a piece of protoplasm above, but leaving the 

 whole nucleus in the larger (lower) cell. (7-10) Normal division of the 

 large cell into two daughter-cells, each of which gives rise to a sperma- 

 tozoon. 



