158 
CLASS CRUSTACEA. 
ancient naturalists. By the moderns they are sometimes 
named land-crabs , ( Cancer cursor , Linn.) In some others of 
them the eyes terminate the pedicles, and form a sort of knob. 
Some of the old continent (0. Rhombea, Fab.), and all of the 
new, are in this case ; but the latter have a peculiar charac- 
ter, announcing that they visit the water more frequently, or 
swim with greater facility ; their feet are more even, more 
flatted, and furnished with a fringe of hairs. 
In the next, the testa, at least in the females, is very slender, 
membranaceous, and flexible ; the body is almost round or 
sub-ovoid. The ocular pedicles are sensibly shorter than in 
the preceding subgenera. 
At first come, 
Mictyris, Latr. 
Their body is sub-ovoid, very much inflated, more narrow 
and obtuse in front, truncated posteriorly, with the hood much 
lessened, and narrowed into a point at its extremity. The 
claws are elbowed at the junction of the third and fourth arti- 
culation ; this latter is almost as large as the hand. The other 
feet are long, with the tarsi angular. Add to these essential 
characters, that the ocular pedicles are curved, and crowned 
with globular eyes ; that the external jaw-feet are very am- 
ple, very hairy at the internal edge, with the second articula- 
tion very large, and the following almost semi-circular. 
Immediately after Mictyris we shall place 
Pinnotheres, Latr. 
Very small Crustacea, living for a part of the year in divers 
bivalve shells. The testa of the females is suborbicular, very 
slender, and very soft, while that of the males is solid, almost 
globular, and a little narrowed into a point in front. The 
feet are of moderate length, and the claws are straight, and 
