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Malacostracan, mal-a-kos′tra-kan, n. an individual belonging to a sub-class of crustaceans, including the shrimps, lobsters, &c.—adj. belonging to this class—also Malacos′tracous.—adj.

The second antennae, mandibles and two pairs of maxillae may also be claimed as of malacostracan type.

To these succeed eight pairs of foliaceous branchial appendages on the front division of the body, followed on the hind division by four pairs of powerful bifurcate swimming feet and two rudimentary pairs, the number, though not the nature, of these appendages being malacostracan.

Amphip�oda, an order of sessile-eyed malacostracan crustaceans, with feet directed partly forward and partly backward.