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Porcellaneous :: Porcellaneous (a.) Having a smooth, compact shell without pores; -- said of certain Foraminifera..

Concave :: Concave (a.) Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex; as, a concave mirror; the concave arch of the sky..

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..

Crush :: Crush (v. i.) To be or become broken down or in, or pressed into a smaller compass, by external weight or force; as, an eggshell crushes easily..

Foliated :: Foliated (a.) Having leaves, or leaflike projections; as, a foliated shell..

Fig-shell :: Fig-shell (n.) A marine univalve shell of the genus Pyrula, or Ficula, resembling a fig in form..

Mother-of-pearl :: Mother-of-pearl (n.) The hard pearly internal layer of several kinds of shells, esp. of pearl oysters, river mussels, and the abalone shells; nacre. See Pearl..

Concameration :: Concameration (n.) A chamber of a multilocular shell.

Torpedo :: Torpedo (n.) A kind of detonating cartridge or shell placed on a rail, and exploded when crushed under the locomotive wheels, -- used as an alarm signal..

Tentaculite :: Tentaculite (n.) Any one of numerous species of small, conical fossil shells found in Paleozoic rocks. They are supposed to be pteropods..

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

Cardo :: Cardo (n.) The hinge of a bivalve shell.

Turtlehead :: Turtlehead (n.) An American perennial herb (Chelone glabra) having white flowers shaped like the head of a turtle. Called also snakehead, shell flower, and balmony..

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

Pallial :: Pallial (a.) Of or pretaining to a mantle, especially to the mantle of mollusks; produced by the mantle; as, the pallial line, or impression, which marks the attachment of the mantle on the inner surface of a bivalve shell. See Illust. of Bivalve..

Sepiostare :: Sepiostare (n.) The bone or shell of cuttlefish. See Illust. under Cuttlefish.

Paludina :: Paludina (n.) Any one of numerous species of freshwater pectinibranchiate mollusks, belonging to Paludina, Melantho, and allied genera. They have an operculated shell which is usually green, often with brown bands. See Illust. of Pond snail, under Pond..

Loricate :: Loricate (v.) Covered with a shell or exterior made of plates somewhat like a coat of mail, as in the armadillo..

Planorbis :: Planorbis (n.) Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form..

Mussel :: Mussel (n.) Any one of many species of marine bivalve shells of the genus Mytilus, and related genera, of the family Mytidae. The common mussel (Mytilus edulis; see Illust. under Byssus), and the larger, or horse, mussel (Modiola modiolus), inhabiting the shores both of Europe and America, are edible. The former is extensively used as food in Europe..

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