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Tubivalve :: Tubivalve (n.) A shell or tube formed by an annelid, as a serpula..

Beard :: Beard (n.) The gills of some bivalves, as the oyster..

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.

Siphonata :: Siphonata (n. pl.) A tribe of bivalve mollusks in which the posterior mantle border is prolonged into two tubes or siphons. Called also Siphoniata. See Siphon, 2 (a), and Quahaug..

Acephala :: Acephala (n. pl.) That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca..

Escutcheon :: Escutcheon (n.) The depression behind the beak of certain bivalves; the ligamental area.

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

Ostrea :: Ostrea (n.) A genus of bivalve Mollusca which includes the true oysters.

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..

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

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

Skimmer :: Skimmer (n.) Any one of several large bivalve shells, sometimes used for skimming milk, as the sea clams, and large scallops..

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

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

Summitless :: Summit (n.) The most elevated part of a bivalve shell, or the part in which the hinge is situated..

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

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..

Wing-shell :: Wing-shell (n.) Any one of various species of marine bivalve shells belonging to the genus Avicula, in which the hinge border projects like a wing..

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..

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