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Bivalve :: Bivalve (a.) Having two shells or valves which open and shut, as the oyster and certain seed vessels..

Exuviation :: Exuviation (n.) The rejecting or casting off of some part, more particularly, the outer cuticular layer, as the shells of crustaceans, skins of snakes, etc.; molting; ecdysis..

Reach :: Reach (v. t.) To strike, hit, or touch with a missile; as, to reach an object with an arrow, a bullet, or a shell..

Lingula :: Lingula (n.) Any one of numerous species of brachiopod shells belonging to the genus Lingula, and related genera. See Brachiopoda, and Illustration in Appendix..

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

Turbinated :: Turbinated (a.) Spiral with the whorls decreasing rapidly from a large base to a pointed apex; -- said of certain shells.

Shrapnel :: Shrapnel (n.) A shrapnel shell; shrapnel shells, collectively..

Shedder :: Shedder (n.) A crab in the act of casting its shell, or immediately afterwards while still soft; -- applied especially to the edible crabs, which are most prized while in this state..

Sinistral :: Sinistral (a.) Having the whorls of the spire revolving or rising to the left; reversed; -- said of certain spiral shells.

Limpet :: Limpet (n.) Any one of many species of marine shellfish of the order Docoglossa, mostly found adhering to rocks, between tides..

Betel :: Betel (n.) A species of pepper (Piper betle), the leaves of which are chewed, with the areca or betel nut and a little shell lime, by the inhabitants of the East Indies. It is a woody climber with ovate many-nerved leaves..

Nacre :: Nacre (n.) A pearly substance which lines the interior of many shells, and is most perfect in the mother-of-pearl. [Written also nacker and naker.] See Pearl, and Mother-of-pearl..

Porcellaneous :: Porcellaneous (a.) Of or pertaining to porcelain; resembling porcelain; as, porcelaneous shells..

Crust :: Crust (n.) The shell of crabs, lobsters, etc..

Equivalved :: Equivalved (a.) Having the valves equal in size and from, as in most bivalve shells..

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

Paucispiral :: Paucispiral (a.) Having few spirals, or whorls; as, a paucispiral operculum or shell..

Nudibranchiata :: Nudibranchiata (n. pl.) A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia..

Discoid :: Discoid (n.) Anything having the form of a discus or disk; particularly, a discoid shell..

Shell :: Shell (n.) The hard covering of an egg.

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