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SUPPLEMENT 
species under the name of vocans ; but no doubt this claw 
serves them either as a buckler or offensive weapon. 
These Crustacea, which, as well as the ocypods, more par- 
ticularly inhabit warm climates, make their dwelling in humid 
soils near shores. 
M. Bose has seen one species ( vocans ) in Carolina rushing 
in crowds upon carcases, covering them, and disputing the 
pieces with the vultures. The burrows formed by another 
species ( pugillator ) are so numerous that they touch. They 
are cylindrical, usually oblique, and very deep. Barely do 
many individuals enter into the same one, for in that case the 
peril would be very imminent. These animals do not fear the 
water, which sometimes covers them, but they do not seek to 
enter it, and never remain there a long time of their own ac- 
cord, except at the time of laying, and until the eggs disclose. 
M. Bose has found from the end of February some females in 
which the under part of the tail was furnished with eggs ; but 
he has never met any young ones in their first age, and he 
suspects that they pass the first year of their existence in the 
water or in the earth. The males are distinguished from the 
females, by being smaller, more coloured, and having the tail 
triangular. The pincers do not indicate sexual difference. 
This species remains during winter, or during three or four 
months, in its burrow, which is almost always closed, so that 
the animal is obliged to re-open it, when the heat of the sun 
is strong enough to force it to quit its dwelling. 
This crustaceum is not an article of food. It has many 
enemies, and such are the otters, the birds, the bears, the tor- 
toises, and other reptiles ; but its multiplication is so exces- 
sive, that no sensible diminution results from their devasta- 
tions. 
The Gelasima maracoani is found at Cayenne and in 
Brazil, running on the sea-shore after a reflux, but remain- 
