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A flattened plate or scale attached to the second joint of the antennæ of many Crustacea.

A thin leafike appendage (the exopodite) of the second maxilla of decapod crustaceans. It serves as a pumping organ to draw the water through the gill cavity.

The hard integument of Crustacea.

An amphipod crustacean; as, the skeleton screw (Caprella). See Sand screw, under Sand. Archimedes screw, Compound screw, Foot screw, etc. See under Archimedes, Compound, Foot, etc. -- A screw loose, something out of order, so that work is not done smoothly; as, there is a screw loose somewhere. H. Martineau. -- Endle…

Any swimming amphipod crustacean. Storm scud. See the Note under Cloud.

One of a family (Scyllaridæ) of macruran Crustacea, remarkable for the depressed form of the body, and the broad, flat antennæ. Also used adjectively.

Any crustacean of the genus Palinurus and allied genera, as the European spiny lobster (P. vulgaris), which is much used as an article of food. See Lobster.

Any one of numerous species of isopod crustaceans of Cymothoa, Livoneca, and allied genera, mostly parasites on fishes.

Any isopod crustacean of the genus Ligia.

tached to some object; as, the oyster is a sedentary mollusk; the barnacles are sedentary crustaceans. Sedentary spider (Zoöl.), one of a tribe of spiders which rest motionless until their prey is caught in their web.

Having eyes which are not elevated on a stalk; -- opposed to stalk-eyed. Sessile-eyed Crustacea, the Arthrostraca.

rigid, bristlelike organ or part; as the hairs of a caterpillar, the slender spines of a crustacean, the hairlike processes of a protozoan, the bristles or stiff hairs on the leaves of some plants, or the pedicel of the capsule of a moss.

The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like.

ring consists of a shell, either testaceous, as in oysters, clams, and other mollusks, or crustaceous, as in lobsters and crabs.

ge-billed Australian plover (Esacus magnirostris). It lives on the seashore, and feeds on crustaceans, etc. -- Shore teetan (Zoöl.), the rock pipit (Anthus obscurus). [Prov. Eng.]

Any one of numerous species of macruran Crustacea belonging to Crangon and various allied genera, having a slender body and long legs. Many of them are used as food. The larger kinds are called also prawns. See Illust. of Decapoda.

The sucking proboscis of certain parasitic insects and crustaceans.

A tribe of parasitic copepod Crustacea including a large number of species that are parasites of fishes, as the lerneans. They have a mouth adapted to suck blood.

f officers, but in which there are few enlisted men. -- Skeleton shrimp (Zoöl.), a small crustacean of the genus Caprella. See Illust. under Læmodipoda.

Any terrestrial isopod crustacean of the genus Porcellio and allied genera; a sow bug.