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Nucleus :: Nucleus (n.) The tip, or earliest part, of a univalve or bivalve shell..

Snowbird :: Snowbird (n.) An arctic finch (Plectrophenax, / Plectrophanes, nivalis) common, in winter, both in Europe and the United States, and often appearing in large flocks during snowstorms. It is partially white, but variously marked with chestnut and brown. Called also snow bunting, snowflake, snowfleck, and snowflight..

Goroon Shell :: Goroon shell () A large, handsome, marine, univalve shell (Triton femorale)..

Peritreme :: Peritreme (n.) The edge of the aperture of a univalve shell.

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

Dolium :: Dolium (n.) A genus of large univalve mollusks, including the partridge shell and tun shells..

Abalone :: Abalone (n.) A univalve mollusk of the genus Haliotis. The shell is lined with mother-of-pearl, and used for ornamental purposes; the sea-ear. Several large species are found on the coast of California, clinging closely to the rocks..

Bubble Shell :: Bubble shell () A marine univalve shell of the genus Bulla and allied genera, belonging to the Tectibranchiata..

Monatomic :: Monatomic (adv.) Having the equivalence or replacing power of an atom of hydrogen; univalent; as, the methyl radical is monatomic..

Univalve :: Univalve (n.) A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs..

Whorl :: Whorl (n. & v.) A volution, or turn, of the spire of a univalve shell..

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

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

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.

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

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

Gyration :: Gyration (n.) One of the whorls of a spiral univalve shell.

Monovalent :: Monovalent (a.) Having a valence of one; univalent. See Univalent.

Univalvular :: Univalvular (a.) Same as Univalve, a..

Mournival :: Mournival (n.) See Murnival.

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