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Wing-shell :: Wing-shell (n.) Any marine gastropod shell of the genus Strombus. See Strombus.

Toothshell :: Toothshell (n.) Any species of Dentalium and allied genera having a tooth-shaped shell. See Dentalium.

Cymbium :: Cymbium (n.) A genus of marine univalve shells; the gondola.

Slit-shell :: Slit-shell (n.) Any species of Pleurotomaria, a genus of beautiful, pearly, spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical seas..

Mactra :: Mactra (n.) Any marine bivalve shell of the genus Mactra, and allied genera. Many species are known. Some of them are used as food, as Mactra stultorum, of Europe. See Surf clam, under Surf..

Belemnite :: Belemnite (n.) A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, where it is ordinarily broken; but when perfect it contains a small chambered cone, called the phragmocone, prolonged, on one side, into a delicate concave blade; the thunderstone. It is the internal shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages..

Nautiloid :: Nautiloid (n.) A mollusk, or shell, of the genus Nautilus or family Nautilidae..

Paucispiral :: Paucispiral (a.) Having few spirals, or whorls; as, a paucispiral operculum or shell..

Shell :: Shell (n.) The outer frame or case of a block within which the sheaves revolve.

Block :: Block (v. t.) A grooved pulley or sheave incased in a frame or shell which is provided with a hook, eye, or strap, by which it may be attached to an object. It is used to change the direction of motion, as in raising a heavy object that can not be conveniently reached, and also, when two or more such sheaves are compounded, to change the rate of motion, or to exert increased force; -- used especially in the rigging of ships, and in tackles..

Calcific :: Calcific (a.) Calciferous. Specifically: (Zool.) of or pertaining to the portion of the oviduct which forms the eggshell in birds and reptiles.

Gyration :: Gyration (n.) One of the whorls of a spiral univalve shell.

Shrapnel :: Shrapnel (n.) A shrapnel shell; shrapnel shells, collectively..

Vitrina :: Vitrina (n.) A genus of terrestrial gastropods, having transparent, very thin, and delicate shells, -- whence the name..

Cone :: Cone (n.) A shell of the genus Conus, having a conical form..

Tentaculite :: Tentaculite (n.) Any one of numerous species of small, conical fossil shells found in Paleozoic rocks. They are supposed to be pteropods..

Mytilus :: Mytilus (n.) A genus of marine bivalve shells, including the common mussel. See Illust. under Byssus..

Torpedo :: Torpedo (n.) A kind of detonating cartridge or shell placed on a rail, and exploded when crushed under the locomotive wheels, -- used as an alarm signal..

Discoid :: Discoid (n.) Anything having the form of a discus or disk; particularly, a discoid shell..

Osselet :: Osselet (n.) The internal bone, or shell, of a cuttlefish..

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