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Lithodome :: Lithodome (n.) Any one of several species of bivalves, which form holes in limestone, in which they live; esp., any species of the genus Lithodomus..

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

Force Pump :: Force pump () A pump having a solid piston, or plunger, for drawing and forcing a liquid, as water, through the valves; in distinction from a pump having a bucket, or valved piston..

Buccinum :: Buccinum (n.) A genus of large univalve mollusks abundant in the arctic seas. It includes the common whelk (B. undatum).

Xylotrya :: Xylotrya (n.) A genus of marine bivalves closely allied to Teredo, and equally destructive to timber. One species (Xylotrya fimbriata) is very common on the Atlantic coast of the United States..

Avicula :: Avicula (n.) A genus of marine bivalves, having a pearly interior, allied to the pearl oyster; -- so called from a supposed resemblance of the typical species to a bird..

Bivalve :: Bivalve (n.) A pericarp in which the seed case opens or splits into two parts or valves.

Acephalous :: Acephalous (a.) Without a distinct head; -- a term applied to bivalve mollusks.

Lag :: Lag (n.) The amount of retardation of anything, as of a valve in a steam engine, in opening or closing..

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

Equivalve :: Equivalve (a.) Alt. of Equivalve.

Heteromyaria :: Heteromyaria (n. pl.) A division of bivalve shells, including the marine mussels, in which the two adductor muscles are very unequal. See Dreissena, and Illust. under Byssus..

Four-way :: Four-way (a.) Allowing passage in either of four directions; as, a four-way cock, or valve..

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

Cut-off :: Cut-off (n.) The valve gearing or mechanism by which steam is cut off from entering the cylinder of a steam engine after a definite point in a stroke, so as to allow the remainder of the stroke to be made by the expansive force of the steam already let in. See Expansion gear, under Expansion..

Lead :: Lead (n.) The width of port opening which is uncovered by the valve, for the admission or release of steam, at the instant when the piston is at end of its stroke..

Cephalata :: Cephalata (n. pl.) A large division of Mollusca, including all except the bivalves; -- so called because the head is distinctly developed. See Illustration in Appendix..

Megastome :: Megastome (n.) One of a group of univalve shells, having a large aperture or mouth..

Ambitus :: Ambitus (n.) The exterior edge or border of a thing, as the border of a leaf, or the outline of a bivalve shell..

Marginella :: Marginella (n.) A genus of small, polished, marine univalve shells, native of all warm seas..

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