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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..

Valvelet :: Valvelet (n.) A little valve; a valvule; especially, one of the pieces which compose the outer covering of a pericarp..

Pandora :: Pandora (n.) A genus of marine bivalves, in which one valve is flat, the other convex..

Mollusca :: Mollusca (n. pl.) One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and Lamellibranchiata, or Conchifera. These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or m

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

Gate :: Gate (n.) A door, valve, or other device, for stopping the passage of water through a dam, lock, pipe, etc..

Valve-shell :: Valve-shell (n.) Any fresh-water gastropod of the genus Valvata.

Cockleshell :: Cockleshell (n.) One of the shells or valves of a cockle.

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

Septifragal :: Septifragal (a.) Breaking from the partitions; -- said of a method of dehiscence in which the valves of a pod break away from the partitions, and these remain attached to the common axis..

Auriculated :: Auriculated (a.) Having ears or appendages like ears; eared. Esp.: (a) (Bot.) Having lobes or appendages like the ear; shaped like the ear; auricled. (b) (Zool.) Having an angular projection on one or both sides, as in certain bivalve shells, the foot of some gastropods, etc..

Dashpot :: Dashpot (n.) A pneumatic or hydraulic cushion for a falling weight, as in the valve gear of a steam engine, to prevent shock..

Equivalvular :: Equivalvular (a.) Same as Equivalve or Equivalved.

Trochus :: Trochus (n.) Any one of numerous species of marine univalve shells belonging to Trochus and many allied genera of the family Trochidae. Some of the species are called also topshells.

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..

Whorl :: Whorl (n. & v.) A volution, or turn, of the spire of a univalve shell..

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..

Summitless :: Summit (n.) The most elevated part of a bivalve shell, or the part in which the hinge is situated..

Dreissena :: Dreissena (n.) A genus of bivalve shells of which one species (D. polymorpha) is often so abundant as to be very troublesome in the fresh waters of Europe.

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..

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