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

Trigonia :: Trigonia (n.) A genus of pearly bivalve shells, numerous extinct species of which are characteristic of the Mesozoic rocks. A few living species exist on the coast of Australia..

Bojanus Organ :: Bojanus organ () A glandular organ of bivalve mollusca, serving in part as a kidney..

Clam :: Clam (v. t.) A bivalve mollusk of many kinds, especially those that are edible; as, the long clam (Mya arenaria), the quahog or round clam (Venus mercenaria), the sea clam or hen clam (Spisula solidissima), and other species of the United States. The name is said to have been given originally to the Tridacna gigas, a huge East Indian bivalve..

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..

Pinna :: Pinna (n.) Any species of Pinna, a genus of large bivalve mollusks found in all warm seas. The byssus consists of a large number of long, silky fibers, which have been used in manufacturing woven fabrics, as a curiosity..

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

Naiad :: Naiad (n.) Any species of a tribe (Naiades) of freshwater bivalves, including Unio, Anodonta, and numerous allied genera; a river mussel..

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

Cardo :: Cardo (n.) The hinge of a bivalve shell.

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..

Tellina :: Tellina (n.) A genus of marine bivalve mollusks having thin, delicate, and often handsomely colored shells..

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..

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

Mytilus :: Mytilus (n.) A genus of marine bivalve shells, including the common mussel. See Illust. under Byssus..

Asiphonida :: Asiphonida (n. pl.) A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks..

Scallop :: Scallop (n.) Any one of numerous species of marine bivalve mollusks of the genus Pecten and allied genera of the family Pectinidae. The shell is usually radially ribbed, and the edge is therefore often undulated in a characteristic manner. The large adductor muscle of some the species is much used as food. One species (Vola Jacobaeus) occurs on the coast of Palestine, and its shell was formerly worn by pilgrims as a mark that they had been to the Holy Land. Called also fan shell. See Pecten, 2..

Siphon :: Siphon (n.) One of the tubes or folds of the mantle border of a bivalve or gastropod mollusk by which water is conducted into the gill cavity. See Illust. under Mya, and Lamellibranchiata..

Asiphonate :: Asiphonate (a.) Destitute of a siphon or breathing tube; -- said of many bivalve shells.

Teredo :: Teredo (n.) A genus of long, slender, wormlike bivalve mollusks which bore into submerged wood, such as the piles of wharves, bottoms of ships, etc.; -- called also shipworm. See Shipworm. See Illust. in App..

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