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Umbo :: Umbo (n.) One of the lateral prominence just above the hinge of a bivalve shell.

Shell :: Shell (n.) Any slight hollow structure; a framework, or exterior structure, regarded as not complete or filled in; as, the shell of a house..

Carinaria :: Carinaria (n.) A genus of oceanic heteropod Mollusca, having a thin, glassy, bonnet-shaped shell, which covers only the nucleus and gills..

Bivalve :: Bivalve (n.) A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, -- or by one, as in the oyster. See Mollusca..

Portfire :: Portfire (n.) A case of strong paper filled with a composition of niter, sulphur, and mealed powder, -- used principally to ignite the priming in proving guns, and as an incendiary material in shells..

Diaphragm :: Diaphragm (n.) A calcareous plate which divides the cavity of certain shells into two parts.

Brachiopod :: Brachiopod (n.) One of the Brachiopoda, or its shell..

Peeper :: Peeper (n.) A chicken just breaking the shell; a young bird.

Exuviae :: Exuviae (n. pl.) The fossil shells and other remains which animals have left in the strata of the earth.

Crustaceous :: Crustaceous (a.) Pertaining to, or of the nature of, crust or shell; having a crustlike shell..

Caddis :: Caddis (n.) The larva of a caddice fly. These larvae generally live in cylindrical cases, open at each end, and covered externally with pieces of broken shells, gravel, bits of wood, etc. They are a favorite bait with anglers. Called also caddice worm, or caddis worm..

Litchi :: Litchi (n.) The fruit of a tree native to China (Nephelium Litchi). It is nutlike, having a rough but tender shell, containing an aromatic pulp, and a single large seed. In the dried fruit which is exported the pulp somewhat resembles a raisin in color and form..

Anisopleura :: Anisopleura (n. pl.) A primary division of gastropods, including those having spiral shells. The two sides of the body are unequally developed..

Conch :: Conch (n.) A name applied to various marine univalve shells; esp. to those of the genus Strombus, which are of large size. S. gigas is the large pink West Indian conch. The large king, queen, and cameo conchs are of the genus Cassis. See Cameo..

Shealing :: Shealing (n.) The outer husk, pod, or shell, as of oats, pease, etc.; sheal; shell..

Lithodomus :: Lithodomus (n.) A genus of elongated bivalve shells, allied to the mussels, and remarkable for their ability to bore holes for shelter, in solid limestone, shells, etc. Called also Lithophagus..

Sutured :: Suture (n.) A seam, or impressed line, as between the segments of a crustacean, or between the whorls of a univalve shell..

Torpedo :: Torpedo (n.) An explosive cartridge or shell lowered or dropped into a bored oil well, and there exploded, to clear the well of obstructions or to open communication with a source of supply of oil..

Leatherback :: Leatherback (n.) A large sea turtle (Sphargis coriacea), having no bony shell on its back. It is common in the warm and temperate parts of the Atlantic, and sometimes weighs over a thousand pounds; -- called also leather turtle, leathery turtle, leather-backed tortoise, etc..

Unilocular :: Unilocular (a.) Having one cell or cavity only; as, a unilocular capsule or shell..

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