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Wing-shell :: Wing-shell (n.) Any pteropod shell.

Scallop :: Scallop (n.) Any one of numerous species of marine bivalve mollusks of the genus Pecten and allied genera of the family Pectinidae. The shell is usually radially ribbed, and the edge is therefore often undulated in a characteristic manner. The large adductor muscle of some the species is much used as food. One species (Vola Jacobaeus) occurs on the coast of Palestine, and its shell was formerly worn by pilgrims as a mark that they had been to the Holy Land. Called also fan shell. See Pecten, 2..

Spatangoidea :: Spatangoidea (n. pl.) An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side..

Testaceography :: Testaceography (n.) The science which treats of testaceans, or shellfish; the description of shellfish..

Tun :: Tun (n.) Any shell belonging to Dolium and allied genera; -- called also tun-shell.

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..

Vermetus :: Vermetus (n.) Any one of many species of marine gastropods belonging to Vermetus and allied genera, of the family Vermetidae. Their shells are regularly spiral when young, but later in life the whorls become separate, and the shell is often irregularly bent and contorted like a worm tube..

Undulated :: Undulated (a.) Formed with elevations and depressions resembling waves; having wavelike color markings; as, an undulated shell..

Lithodomus :: Lithodomus (n.) A genus of elongated bivalve shells, allied to the mussels, and remarkable for their ability to bore holes for shelter, in solid limestone, shells, etc. Called also Lithophagus..

Nates :: Nates (n. pl.) The umbones of a bivalve shell.

Periwinkle :: Periwinkle (n.) Any small marine gastropod shell of the genus Littorina. The common European species (Littorina littorea), in Europe extensively used as food, has recently become naturalized abundantly on the American coast. See Littorina..

Argonauta :: Argonauta (n.) A genus of Cephalopoda. The shell is called paper nautilus or paper sailor.

Pyrula :: Pyrula (n.) A genus of large marine gastropods. having a pear-shaped shell. It includes the fig-shells. See Illust. in Appendix.

Summitless :: Summit (n.) The most elevated part of a bivalve shell, or the part in which the hinge is situated..

Tripoli :: Tripoli (n.) An earthy substance originally brought from Tripoli, used in polishing stones and metals. It consists almost wholly of the siliceous shells of diatoms..

Holostraca :: Holostraca (n. pl.) A division of phyllopod Crustacea, including those that are entirely covered by a bivalve shell..

Conchoidal :: Conchoidal (a.) Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.

Calabash :: Calabash (n.) A water dipper, bottle, bascket, or other utensil, made from the dry shell of a calabash or gourd..

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

Trigonia :: Trigonia (n.) A genus of pearly bivalve shells, numerous extinct species of which are characteristic of the Mesozoic rocks. A few living species exist on the coast of Australia..

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