324 



SEXUAL SELECTION. 



[Part II. 



male was again put into the same vessel and he then, after 

 swimming about for a time, dashed into the crowd, and 

 without any fighting at once took away his wife. This 



Fig. 7. — Orchestia Darwinii (from Fritz Miiller), showing the differently-con* 

 structed chelae of the two male forms. 



fact shows that in the Amphipoda, an order low in the 

 scale, the males and females recognize each other, and are 

 mutually attached. 



