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Cowry :: Cowry (n.) A marine shell of the genus Cypraea.

Marginella :: Marginella (n.) A genus of small, polished, marine univalve shells, native of all warm seas..

Pearl :: Pearl (n.) A shelly concretion, usually rounded, and having a brilliant luster, with varying tints, found in the mantle, or between the mantle and shell, of certain bivalve mollusks, especially in the pearl oysters and river mussels, and sometimes in certain univalves. It is usually due to a secretion of shelly substance around some irritating foreign particle. Its substance is the same as nacre, or mother-of-pearl. Pearls which are round, or nearly round, and of fine luster, are highly esteemed

Scallop :: Scallop (v. t.) To mark or cut the edge or border of into segments of circles, like the edge or surface of a scallop shell. See Scallop, n., 2..

Unilocular :: Unilocular (a.) Having one cell or cavity only; as, a unilocular capsule or shell..

Eggshell :: Eggshell (n.) The shell or exterior covering of an egg. Also used figuratively for anything resembling an eggshell.

Sutured :: Suture (n.) A seam, or impressed line, as between the segments of a crustacean, or between the whorls of a univalve shell..

Crusta :: Crusta (n.) A crust or shell.

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

Nautilus :: Nautilus (n.) The only existing genus of tetrabranchiate cephalopods. About four species are found living in the tropical Pacific, but many other species are found fossil. The shell is spiral, symmetrical, and chambered, or divided into several cavities by simple curved partitions, which are traversed and connected together by a continuous and nearly central tube or siphuncle. See Tetrabranchiata..

Explode :: Explode (v. i.) To burst with force and a loud report; to detonate, as a shell filled with powder or the like material, or as a boiler from too great pressure of steam..

Megastome :: Megastome (n.) One of a group of univalve shells, having a large aperture or mouth..

Trochus :: Trochus (n.) Any one of numerous species of marine univalve shells belonging to Trochus and many allied genera of the family Trochidae. Some of the species are called also topshells.

Sounding :: Sounding (n.) The sand, shells, or the like, that are brought up by the sounding lead when it has touched bottom..

Calamary :: Calamary (n.) A cephalopod, belonging to the genus Loligo and related genera. There are many species. They have a sack of inklike fluid which they discharge from the siphon tube, when pursued or alarmed, in order to confuse their enemies. Their shell is a thin horny plate, within the flesh of the back, shaped very much like a quill pen. In America they are called squids. See Squid..

Umbilicus :: Umbilicus (n.) A depression or opening in the center of the base of many spiral shells.

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

Turbo :: Turbo (n.) Any one of numerous marine gastropods of the genus Turbo or family Turbinidae, usually having a turbinate shell, pearly on the inside, and a calcareous operculum..

Bulimus :: Bulimus (n.) A genus of land snails having an elongated spiral shell, often of large size. The species are numerous and abundant in tropical America..

Conch :: Conch (n.) In works of art, the shell used by Tritons as a trumpet..

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