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

Drill :: Drill (n.) 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..

Cornu Ammonis :: Cornu Ammonis () A fossil shell, curved like a ram's horn; an obsolete name for an ammonite..

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

Bimarginate :: Bimarginate (a.) Having a double margin, as certain shells..

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..

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

Perforata :: Perforata (n. pl.) A division of Foraminifera, including those having perforated shells..

Sankha :: Sankha (n.) A chank shell (Turbinella pyrum); also, a shell bracelet or necklace made in India from the chank shell..

Siphonifer :: Siphonifer (n.) Any cephalopod having a siphonate shell.

Reversed :: Reversed (a.) Turned side for side, or end for end; changed to the contrary; specifically (Bot. & Zool.), sinistrorse or sinistral; as, a reversed, or sinistral, spiral or shell..

Right-handed :: Right-handed (a.) Having the whorls rising from left to right; dextral; -- said of spiral shells. See Illust. of Scalaria.

Scallop :: Scallop (n.) One of the shells of a scallop; also, a dish resembling a scallop shell..

Plastron :: Plastron (n.) The ventral shield or shell of tortoises and turtles. See Testudinata.

Inoperculate :: Inoperculate (a.) Having no operculum; -- said of certain gastropod shells.

Bipeltate :: Bipeltate (a.) Having a shell or covering like a double shield.

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..

Calcific :: Calcific (a.) Calciferous. Specifically: (Zool.) of or pertaining to the portion of the oviduct which forms the eggshell in birds and reptiles.

Stromeyerite :: Strombus (n.) A genus of marine gastropods in which the shell has the outer lip dilated into a broad wing. It includes many large and handsome species commonly called conch shells, or conchs. See Conch..

Picking :: Picking (n.) The pulverized shells of oysters used in making walks.

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