With regard to the Malacostraca or crustaceans, one species is
that of the crawfish, and a second, resembling the first, is that of
the lobster; the lobster differing from the crawfish in having
claws, and in a few other respects as well. Another species is that of
the carid, and another is that of the crab, and there are many kinds
both of carid and of crab.

Of carids there are the so-called cyphae, or 'hunch-backs', the
crangons, or squillae, and the little kind, or shrimps, and the little
kind do not develop into a larger kind.

Of the crab, the varieties are indefinite and incalculable. The
largest of all crabs is one nicknamed Maia, a second variety is the
pagarus and the crab of Heracleotis, and a third variety is the
fresh-water crab; the other varieties are smaller in size and
destitute of special designations. In the neighbourhood of Phoenice
there are found on the beach certain crabs that are nicknamed the
'horsemen', from their running with such speed that it is difficult to
overtake them; these crabs, when opened, are usually found empty,
and this emptiness may be put down to insufficiency of nutriment.
(There is another variety, small like the crab, but resembling in
shape the lobster.) All these animals, as has been stated, have
their hard and shelly part outside, where the skin is in other
animals, and the fleshy part inside; and the belly is more or less
provided with lamellae, or little flaps, and the female here
deposits her spawn.