Chap. IX. 



Crustaceans. 



269 



weapons well adapted for fighting. Tims when a Devil-crab 

 (Portunus jwbcr) was seen by a son of Mr. Bate fighting with a 

 Carcinus mcenas, the latter was soon thrown on its back, and had 

 every limb torn from its body. "When several males of a Brazilian 

 Gelasimus, a species furnished with immense pincers, were 

 placed together in a glass vessel by Fritz Miiller, they mutilated 

 and killed one another. Mr. Bate put a large male Carcinus 





V 



~^\ 





Fig. 8. Orchestia Darwinii (from Fritz Miiller), showing the differently-construcieci 



ehehe of the two male forms. 



mcenas into a pan of water, inhabited by a female which was 

 paired with a smaller male ; but the latter was soon dispossessed. 



