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Quadrivalve :: Quadrivalve (a.) Dehiscent into four similar parts; four-valved; as, a quadrivalve pericarp..

Ark Shell :: Ark shell () A marine bivalve shell belonging to the genus Arca and its allies.

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

Cyphonautes :: Cyphonautes (n.) The free-swimming, bivalve larva of certain Bryozoa..

Water Gate :: Water gate () A gate, or valve, by which a flow of water is permitted, prevented, or regulated..

Valvate :: Valvate (a.) Resembling, or serving as, a valve; consisting of, or opening by, a valve or valves; valvular..

Valve :: Valve (n.) One of the pieces or divisions of bivalve or multivalve shells.

Suprachoroid :: Suprabranchial (a.) Situated above the branchiae; -- applied especially to the upper division of the gill cavity of bivalve mollusks.

Labrum :: Labrum (n.) The external margin of the aperture of a shell. See Univalve.

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..

Stopcock :: Stopcock (n.) A bib, faucet, or short pipe, fitted with a turning stopper or plug for permitting or restraining the flow of a liquid or gas; a cock or valve for checking or regulating the flow of water, gas, etc., through or from a pipe, etc..

Bear''s-paw :: Bear's-paw (n.) A large bivalve shell of the East Indies (Hippopus maculatus), often used as an ornament..

Air Gun :: Air gun () A kind of gun in which the elastic force of condensed air is used to discharge the ball. The air is powerfully compressed into a reservoir attached to the gun, by a condensing pump, and is controlled by a valve actuated by the trigger..

Buccinoid :: Buccinoid (a.) Resembling the genus Buccinum, or pertaining to the Buccinidae, a family of marine univalve shells. See Whelk, and Prosobranchiata..

Concho-spiral :: Concho-spiral (n.) A kind of spiral curve found in certain univalve shells.

Ganoidei :: Ganoidei (n. pl.) One of the subclasses of fishes. They have an arterial cone and bulb, spiral intestinal valve, and the optic nerves united by a chiasma. Many of the species are covered with bony plates, or with ganoid scales; others have cycloid scales..

Siphonata :: Siphonata (n. pl.) A tribe of bivalve mollusks in which the posterior mantle border is prolonged into two tubes or siphons. Called also Siphoniata. See Siphon, 2 (a), and Quahaug..

Anodon :: Anodon (n.) A genus of fresh-water bivalves, having no teeth at the hinge..

Pump :: Pump (n.) An hydraulic machine, variously constructed, for raising or transferring fluids, consisting essentially of a moving piece or piston working in a hollow cylinder or other cavity, with valves properly placed for admitting or retaining the fluid as it is drawn or driven through them by the action of the piston..

Bivalvular :: Bivalvular (a.) Having two valves.

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