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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.

Any natural deposit forming a part of the earth's crust, whether consolidated or not, including sand, earth, clay, etc., when in natural beds.

A round mass, plate, or disk; especially (Metal.), the crust or scale which forms upon the surface of molten metal in the crucible.

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

ase and filled with serous, purulent, or bloody fluid, which dries up, forming a blackish crust.

Surly; morose; crusty; sullen. [Obs. or Prov. Eng.] "Rusty words." Piers Plowman.

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.

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.