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sal portion, or two proximal and more or less consolidated segments, of an appendage of a crustacean.

The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.

Having feet or legs that are used as oars; -- said of certain crustaceans and insects.

The anterior, often spinelike, prolongation of the carapace of a crustacean, as in the lobster and the prawn.

lation we may bring. Salve to thy sores. Milton. Salve bug (Zoöl.), a large, stout isopod crustacean (Æga psora), parasitic on the halibut and codfish, -- used by fishermen in the preparation of a salve. It becomes about two inches in length.

and scatters the seeds. See Illust. of Regma. -- Sand bug (Zoöl.), an American anomuran crustacean (Hippa talpoidea) which burrows in sandy seabeaches. It is often used as bait by fishermen. See Illust. under Anomura. -- Sand canal (Zoöl.), a tubular vessel having a calcareous coating, and connecting the oral ambula…

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.

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.

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.

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.

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.]

In a loose sense, any small crustacean, including some amphipods and even certain entomostracans; as, the fairy shrimp, and brine shrimp. See under Fairy, and Brine.

The sucking proboscis of certain parasitic insects and crustaceans.

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.