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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..

Ostracoidea :: Ostracoidea (n. pl.) An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about..

Sea Clam :: Sea clam () Any one of the large bivalve mollusks found on the open seacoast, especially those of the family Mactridae, as the common American species. (Mactra, / Spisula, solidissima); -- called also beach clam, and surf clam..

Escutcheon :: Escutcheon (n.) The depression behind the beak of certain bivalves; the ligamental area.

Legume :: Legume (n.) A pod dehiscent into two pieces or valves, and having the seed attached at one suture, as that of the pea..

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

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

Sea Trumpet :: Sea trumpet () Any large marine univalve shell of the genus Triton. See Triton.

Nucleus :: Nucleus (n.) The tip, or earliest part, of a univalve or bivalve shell..

Valve :: Valve (n.) One or more membranous partitions, flaps, or folds, which permit the passage of the contents of a vessel or cavity in one direction, but stop or retard the flow in the opposite direction; as, the ileocolic, mitral, and semilunar valves..

Scutum :: Scutum (n.) One of the two lower valves of the operculum of a barnacle.

Abalone :: Abalone (n.) A univalve mollusk of the genus Haliotis. The shell is lined with mother-of-pearl, and used for ornamental purposes; the sea-ear. Several large species are found on the coast of California, clinging closely to the rocks..

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

Intravalvular :: Intravalvular (a.) Between valves.

Multivalve :: Multivalve (a.) Alt. of Multivalvula.

Tube-shell :: Tube-shell (n.) Any bivalve mollusk which secretes a shelly tube around its siphon, as the watering-shell..

Malacobdella :: Malacobdella (n.) A genus of nemertean worms, parasitic in the gill cavity of clams and other bivalves. They have a large posterior sucker, like that of a leech. See Illust. of Bdellomorpha..

Rudistes :: Rudistes (n. pl.) An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.

Pallet :: Pallet (n.) In the organ, a valve between the wind chest and the mouth of a pipe or row of pipes..

Quinquevalve :: Quinquevalve (a.) Alt. of Quinquevalvula.

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