Chap. IX. 
CRUSTACEANS. 
333 
When several males of a Brazilian Gelasimus, a species 
furnished with immense pincers, were placed together 
by Fritz Muller in a glass vessel, they mutilated and 
killed each other. Mr. Bate put a large male Carcinus 
Fig. 7. Orchestia Darwinii (from Fritz Muller), showing the differently-constructed 
chehe of the two male forms. 
msenas into a pan of water, inhabited by a female paired 
with a smaller male ; the latter was soon dispossessed, 
but, as Mr. Bate adds, “ if they fought, the victory 
