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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

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.

Integropallial :: Integropallial (a.) Having the pallial line entire, or without a sinus, as certain bivalve shells..

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..

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

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..

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

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..

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..

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

Subumbrella :: Subumbonal (a.) Beneath or forward of the umbos of a bivalve shell.

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

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

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..

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..

Brachiopoda :: Brachiopoda (n.) A class of Molluscoidea having a symmetrical bivalve shell, often attached by a fleshy peduncle..

Inclusa :: Inclusa (n. pl.) A tribe of bivalve mollusks, characterized by the closed state of the mantle which envelops the body. The ship borer (Teredo navalis) is an example..

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

Eye :: Eye (n.) The scar to which the adductor muscle is attached in oysters and other bivalve shells; also, the adductor muscle itself, esp. when used as food, as in the scallop..

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

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