PINNOTHERES. 
53 
Some of the species live inside bivalve shells, but the 
greater number live free. Some of the exotic species, such 
as the Land Crabs of the West Indies, only visit the sea 
to hatch their eggs ; others, as the species of Ocypode, can 
run with great agility. 
Lam. PINNOTHERIDJE , Leach. 
Carapace circular, at least as long as wide. Abdomen of 
the male with the second joint much narrower than the 
corresponding part of the sternal shield. Front generally 
very narrow. Eye-stalks very short. Fourth joint of outer 
jaw-feet fixed at the top or outer angle of the third joint. 
The species of this family are of small size, and they live 
parasitically within the lobes of the mantle of bivalve shells. 
The females are much larger and much more soft than their 
mates. 
Gen. 16. PINNOTHERES, Latr. 
Front wide enough to conceal beneath it the inner an- 
tennae. The outer jaw-feet, when closed, semilunar in front, 
very wide behind ; the inner antennae transverse. Carapace 
and body circular, and rounded above. Abdomen of male 
very small; of female much swollen and wider than the 
sternal shield. 
