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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..

Undulated :: Undulated (a.) Formed with elevations and depressions resembling waves; having wavelike color markings; as, an undulated shell..

Chambered :: Chambered (a.) Having a chamber or chambers; as, a chambered shell; a chambered gun..

Operculum :: Operculum (n.) Any lid-shaped structure closing the aperture of a tube or shell.

Polythalamia :: Polythalamia (n. pl.) A division of Foraminifera including those having a manychambered shell.

Conchiform :: Conchiform (a.) Shaped like one half of a bivalve shell; shell-shaped.

Stoolball :: Stool (n.) Material, such as oyster shells, spread on the sea bottom for oyster spat to adhere to..

Escalop :: Escalop (n.) A bearing or a charge consisting of an escalop shell.

Chank :: Chank (n.) The East Indian name for the large spiral shell of several species of sea conch much used in making bangles, esp. Turbinella pyrum. Called also chank chell..

Whorl :: Whorl (n. & v.) A volution, or turn, of the spire of a univalve shell..

Nodosarine :: Nodosarine (a.) Resembling in form or structure a foraminiferous shell of the genus Nodosaria.

Caddis :: Caddis (n.) The larva of a caddice fly. These larvae generally live in cylindrical cases, open at each end, and covered externally with pieces of broken shells, gravel, bits of wood, etc. They are a favorite bait with anglers. Called also caddice worm, or caddis worm..

Shuck :: Shuck (n.) The shell of an oyster or clam.

Sheal :: Sheal (n.) A shell or pod.

Orthoceratite :: Orthoceratite (n.) An orthoceras; also, any fossil shell allied to Orthoceras..

Exuviae :: Exuviae (n. pl.) The fossil shells and other remains which animals have left in the strata of the earth.

Testudineous :: Testudineous (a.) Resembling the shell of a tortoise.

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

Umbrella :: Umbrella (n.) Any marine tectibranchiate gastropod of the genus Umbrella, having an umbrella-shaped shell; -- called also umbrella shell..

Auriculated :: Auriculated (a.) Having ears or appendages like ears; eared. Esp.: (a) (Bot.) Having lobes or appendages like the ear; shaped like the ear; auricled. (b) (Zool.) Having an angular projection on one or both sides, as in certain bivalve shells, the foot of some gastropods, etc..

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