266 



THE DESCENT OF MAN. 



"ifiey (ought, the victory was a bloodless one, for I saw no 

 "wounds." This same naturalist separated a male sand-skipper 

 (so common on our sea-shores), Gammarus marinus, from its 

 female, both of whom were imprisoned in the same vessel with 

 many individuals of the same species. The female, when thus 



Fig. 8. Orchestia Darwinii (from Fritz Muller), showing the differ- 

 ently-constructed chelae 01' the two male forms. 



divorced, soon joined the others. After a time the male was put 

 again 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 fact shows that in the Amphi- 

 poda, an order low in the scale, the males and females recognize 

 each other, and are mutually attached. 



