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The gill of a crustacean in which the branchial filaments are slender and cylindrical, as in the crawfishes.

ore or less cylindrical, and often spiral, case secreted or constructed by many annelids, crustaceans, insects, and other animals, for protection or concealment. See Illust. of Tubeworm.

A yellow, earthy incrustation, consisting essentially of the oxide of uranium, but more or less impure.

Behind the stomach; -- said of two lobes of the carapace of certain crustaceans.

Any one of the abdominal appendages of a crustacean, especially one of the posterior ones, which are often larger than the rest, and different in structure, and are used chiefly in locomotion. See Illust. of Crustacea, and Stomapoda.

of which little is known. It is said by Scacchi to have been extracted from a yellowish incrustation from the cracks of a Vesuvian lava erupted in 1631.

taking, whales. -- Whale louse (Zoöl.), any one of several species of degraded amphipod crustaceans belonging to the genus Cyamus, especially C. ceti. They are parasitic on various cetaceans. -- Whale's bone, ivory. [Obs.] -- Whale shark. (Zoöl.) (a) The basking, or liver, shark. (b) A very large harmless shark (Rhi…

n wood, as the teredos, and species of Xylophaga. (e) Any one of several species of small Crustacea, as the Limnoria, and the boring amphipod (Chelura terebrans). -- Wood carpet, a kind of floor covering made of thin pieces of wood secured to a flexible backing, as of cloth. Knight. -- Wood cell (Bot.), a slender cyl…

Eating, boring in, or destroying, wood; -- said especially of certain insect larvæ, crustaceans, and mollusks.

A hydrous carbonate of nickel occurring as an emerald-green incrustation on chromite; -- called also emerald nickel.

nc, oxide of zinc] (Min.), hydrous carbonate of zinc, usually occurring in white earthy incrustations; -- called also hydrozincite. -- Zinc ethyl (Chem.), a colorless, transparent, poisonous liquid, composed of zinc and ethyl, which takes fire spontaneously on exposure to the atmosphere. -- Zinc green, a green pigmen…

A peculiar larval stage of certain decapod Crustacea, especially of crabs and certain Anomura. [Written also zoæa.]