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Univalved :: Univalved (a.) Having one valve; as, a univalve shell or pericarp..

Cingulum :: Cingulum (n.) A distinct girdle or band of color; a raised spiral line as seen on certain univalve shells.

Conchiform :: Conchiform (a.) Shaped like one half of a bivalve shell; shell-shaped.

Double-beat Valve :: Double-beat valve () See under Valve.

Lip :: Lip (n.) One of the edges of the aperture of a univalve shell.

Wing-shell :: Wing-shell (n.) Any one of various species of marine bivalve shells belonging to the genus Avicula, in which the hinge border projects like a wing..

Silique :: Silique (n.) An oblong or elongated seed vessel, consisting of two valves with a dissepiment between, and opening by sutures at either margin. The seeds are attached to both edges of the dissepiment, alternately upon each side of it..

Cypris :: Cypris (n.) A genus of small, bivalve, fresh-water Crustacea, belonging to the Ostracoda; also, a member of this genus..

Myaria :: Myaria (n. pl.) A division of bivalve mollusks of which the common clam (Mya) is the type.

Bonnet :: Bonnet (n.) In pumps, a metal covering for the openings in the valve chambers..

Ostracea :: Ostracea (n. pl.) A division of bivalve mollusks including the oysters and allied shells.

Pearl :: Pearl (n.) A shelly concretion, usually rounded, and having a brilliant luster, with varying tints, found in the mantle, or between the mantle and shell, of certain bivalve mollusks, especially in the pearl oysters and river mussels, and sometimes in certain univalves. It is usually due to a secretion of shelly substance around some irritating foreign particle. Its substance is the same as nacre, or mother-of-pearl. Pearls which are round, or nearly round, and of fine luster, are highly esteemed

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

Holostomatous :: Holostomatous (a.) Having an entire aperture; -- said of many univalve shells.

Veneracea :: Veneracea (n. pl.) An extensive tribe of bivalve mollusks of which the genus Venus is the type. The shells are usually oval, or somewhat heartshaped, with a conspicuous lunule. See Venus..

Valvule :: Valvule (n.) A small valvelike process.

Port :: Port (n.) A passageway in a machine, through which a fluid, as steam, water, etc., may pass, as from a valve to the interior of the cylinder of a steam engine; an opening in a valve seat, or valve face..

Tridacna :: Tridacna (n.) A genus of very large marine bivalve shells found on the coral reefs of the Indian and Pacific Oceans. One species (T. gigas) often weighs four or five hundred pounds, and is sometimes used for baptismal fonts. Called also paw shell, and fountain shell..

Holostraca :: Holostraca (n. pl.) A division of phyllopod Crustacea, including those that are entirely covered by a bivalve shell..

Bellows :: Bellows (n. sing. & pl.) An instrument, utensil, or machine, which, by alternate expansion and contraction, or by rise and fall of the top, draws in air through a valve and expels it through a tube for various purposes, as blowing fires, ventilating mines, or filling the pipes of an organ with wind..

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