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Pallet :: Pallet (n.) One of a pair of shelly plates that protect the siphon tubes of certain bivalves, as the Teredo. See Illust. of Teredo..

Spoutless :: Spoutfish (n.) A marine animal that spouts water; -- applied especially to certain bivalve mollusks, like the long clams (Mya), which spout, or squirt out, water when retiring into their holes..

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..

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.

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

Veliger :: Veliger (n.) Any larval gastropod or bivalve mollusk in the state when it is furnished with one or two ciliated membranes for swimming.

Bear''s-paw :: Bear's-paw (n.) A large bivalve shell of the East Indies (Hippopus maculatus), often used as an ornament..

Pholas :: Pholas (n.) Any one of numerous species of marine bivalve mollusks of the genus Pholas, or family Pholadidae. They bore holes for themselves in clay, peat, and soft rocks..

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

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

Mya :: Mya (n.) A genus of bivalve mollusks, including the common long, or soft-shelled, clam..

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..

Byssus :: Byssus (n.) A tuft of long, tough filaments which are formed in a groove of the foot, and issue from between the valves of certain bivalve mollusks, as the Pinna and Mytilus, by which they attach themselves to rocks, etc..

Pallial :: Pallial (a.) Of or pretaining to a mantle, especially to the mantle of mollusks; produced by the mantle; as, the pallial line, or impression, which marks the attachment of the mantle on the inner surface of a bivalve shell. See Illust. of Bivalve..

Tube :: Tube (n.) One of the siphons of a bivalve mollusk.

Saxicava :: Saxicava (n.) Any species of marine bivalve shells of the genus Saxicava. Some of the species are noted for their power of boring holes in limestone and similar rocks.

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..

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

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

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..

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