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Any one of the gills of a crustacean that is attached to the side of the thorax.

One of lateral processes of a somite of a crustacean.

One of branchiæ attached to the bases of the legs in Crustacea.

The stalk-eyed Crustacea, -- an order of Crustacea having the eyes supported on movable stalks. It includes the crabs, lobsters, and prawns. Called also Podophthalmata, and Decapoda.

The eyestalk of a crustacean.

Having numerous facets; -- said of the compound eyes of insects and crustaceans.

That part of a crustacean behind the cephalothorax; -- more commonly called abdomen.

Any one of numerous species of large shrimplike Crustacea having slender legs and long antennæ. They mostly belong to the genera Pandalus, Palæmon, Palæmonetes, and Peneus, and are much used as food. The common English prawn in Palæmon serratus.

The segment next to the flagellum of the antennæ of Crustacea.

The sixth joint of a typical leg of a crustacean; usually, the penultimate joint.

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.

A division of Pectostraca including saclike parasites of Crustacea. They adhere by rootlike extensions of the head. See Illusration in Appendix.

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…

Native boric acid, found in saline incrustations on the borders of hot springs near Sasso, in the territory of Florence.

An incrustation over a sore, wound, vesicle, or pustule, formed by the drying up of the discharge from the diseased part.

An incrustation deposit on the inside of a vessel in which water is heated, as a steam boiler.