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Dimyaria :: Dimyaria (n. pl.) An order of lamellibranchiate mollusks having an anterior and posterior adductor muscle, as the common clam. See Bivalve..

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..

Trough-shell :: Trough-shell (n.) Any bivalve shell of the genus Mactra. See Mactra.

Inoceramus :: Inoceramus (n.) An extinct genus of large, fossil, bivalve shells,allied to the mussels. The genus is characteristic of the Cretaceous period..

Pallium :: Pallium (n.) The mantle of a bivalve. See Mantle.

Malleus :: Malleus (n.) A genus of bivalve shells; the hammer shell.

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..

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

Nucula :: Nucula (n.) A genus of small marine bivalve shells, having a pearly interior..

Umbo :: Umbo (n.) One of the lateral prominence just above the hinge of a bivalve shell.

Borer :: Borer (n.) A marine, bivalve mollusk, of the genus Teredo and allies, which burrows in wood. See Teredo..

Typhlosole :: Typhlosole (n.) A fold of the wall which projects into the cavity of the intestine in bivalve mollusks, certain annelids, starfishes, and some other animals..

Wedge-shell :: Wedge-shell (n.) Any one of numerous species of small marine bivalves belonging to Donax and allied genera in which the shell is wedge-shaped.

Bivalved :: Bivalved (a.) Having two valves, as the oyster and some seed pods; bivalve..

Nates :: Nates (n. pl.) The umbones of a bivalve shell.

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

Hippurite :: Hippurite (n.) A fossil bivalve mollusk of the genus Hippurites, of many species, having a conical, cup-shaped under valve, with a flattish upper valve or lid. Hippurites are found only in the Cretaceous rocks..

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..

Lamellibranchiata :: Lamellibranchiata (n. pl.) A class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc..

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

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