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A marine, bivalve mollusk, of the genus Teredo and allies, which burrows in wood. See Teredo.

A class of Molluscoidea having a symmetrical bivalve shell, often attached by a fleshy peduncle.

ts 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.

n.) Aries, Lidra, Cancer, and Capricorn. -- Cardinal teeth (Zoöl.), the central teeth of bivalve shell. See Bivalve. -- Cardinal veins (Anat.), the veins in vertebrate embryos, which run each side of the vertebral column and returm the blood to the heart. They remain through life in some fishes. -- Cardinal virtues,…

The hinge of a bivalve shell.

A large division of Mollusca, including all except the bivalves; -- so called because the head is distinctly developed. See Illustration in Appendix.

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 Indi…

A bivalve mollusk, with radiating ribs, of the genus Cardium, especially C. edule, used in Europe for food; -- sometimes applied to similar shells of other genera.

That class of Mollusca which includes the bivalve shells; the Lamellibranchiata. See Mollusca.

Shaped like one half of a bivalve shell; shell-shaped.

Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.

The free-swimming, bivalve larva of certain Bryozoa.

A genus of small, bivalve, freshwater Crustacea, belonging to the Ostracoda; also, a member of this genus.

chiate mollusks having an anterior and posterior adductor muscle, as the common clam. See Bivalve.

A genus of bivalve shells of which one species (D. polymorpha) is often so abundant as to be very troublesome in the fresh waters of Europe.

A marine gastropod, of several species, which kills oysters and other bivalves by drilling holes through the shell. The most destructive kind is Urosalpinx cinerea. Bow drill, Breast drill. See under Bow, Breast. -- Cotter drill, or Traverse drill, a machine tool for drilling slots. -- Diamond drill. See under Diamon…

Having the valves equal in size and from, as in most bivalve shells.

A bivalve shell of the genus Pecten. See Scallop.

The depression behind the beak of certain bivalves; the ligamental area. Escutcheon of pretense, an escutcheon used in English heraldry to display the arms of the bearer's wife; -- not commonly used unless she an heiress. Cf. Impalement.

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.