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

Tube-shell :: Tube-shell (n.) Any bivalve mollusk which secretes a shelly tube around its siphon, as the watering-shell..

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

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

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..

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

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

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

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

Escalop :: Escalop (n.) A bivalve shell of the genus Pecten. See Scallop.

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

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..

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

Lunule :: Lunule (n.) A special area in front of the beak of many bivalve shells. It sometimes has the shape of a double crescent, but is oftener heart-shaped. See Illust. of Bivalve..

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

Tridacna :: Tridacna (n.) A genus of very large marine bivalve shells found on the coral reefs of the Indian and Pacific Oceans. One species (T. gigas) often weighs four or five hundred pounds, and is sometimes used for baptismal fonts. Called also paw shell, and fountain shell..

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..

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..

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

Beak :: Beak (n.) The upper or projecting part of the shell, near the hinge of a bivalve..

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