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Maara Shell :: Maara shell () A large, pearly, spiral, marine shell (Turbo margaritaceus), from the Pacific Islands. It is used as an ornament..

Columella :: Columella (n.) The upright pillar in the axis of most univalve shells.

Ootype :: Ootype (n.) The part of the oviduct of certain trematode worms in which the ova are completed and furnished with a shell.

Cocoanut :: Cocoanut (n.) The large, hard-shelled nut of the cocoa palm. It yields an agreeable milky liquid and a white meat or albumen much used as food and in making oil..

Tortoise :: Tortoise (n.) having a color like that of a tortoise's shell, black with white and orange spots; -- used mostly to describe cats of that color..

Pearly :: Pearly (a.) Containing pearls; abounding with, or yielding, pearls; as, pearly shells..

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

Solenacean :: Solenacean (n.) Any species of marine bivalve shells belonging to the family Solenidae.

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..

Multispiral :: Multispiral (a.) Having numerous spiral coils round a center or nucleus; -- said of the opercula of certain shells.

Protoconch :: Protoconch (n.) The embryonic shell, or first chamber, of ammonites and other cephalopods..

Siphon :: Siphon (n.) The anterior prolongation of the margin of any gastropod shell for the protection of the soft siphon.

Wing-shell :: Wing-shell (n.) Any marine gastropod shell of the genus Strombus. See Strombus.

Sandworm :: Sandworm (n.) Any species of annelids of the genus Sabellaria. They construct firm tubes of agglutinated sand on rocks and shells, and are sometimes destructive to oysters..

Plongee :: Plongee (n.) A slope or sloping toward the front; as, the plongee of a parapet; the plongee of a shell in its course..

Concavo-convex :: Concavo-convex (a.) Concave on one side and convex on the other, as an eggshell or a crescent..

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..

Conchometer :: Conchometer (n.) An instrument for measuring shells, or the angle of their spire..

Cingulum :: Cingulum (n.) A distinct girdle or band of color; a raised spiral line as seen on certain univalve shells.

Hard-shell :: Hard-shell (a.) Unyielding; insensible to argument; uncompromising; strict.

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