Chap. IX. 



CRUSTACEANS. 



333 



When several males of a Brazilian Gelasimus, a species 

 furnished with immense pincers, were placed together 

 by Fritz Miiller in a glass vessel, they mutilated and 

 killed each other. Mr. Bate put a large male Carcinus 





; j' !r^ r ^r r 









Kig. 7. Oichestia Darwinii (from Fritz IVIuller), showing the different ly-cm istriu ted 



chehe of the two male forms. 



mamas into a pan of water, inhabited by a female paired 

 with a smaller male ; the Litter was soon dispossessed, 

 but, as Mr. Bate adds, " if they fought, the victor)' 



