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

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

Buccinoid :: Buccinoid (a.) Resembling the genus Buccinum, or pertaining to the Buccinidae, a family of marine univalve shells. See Whelk, and Prosobranchiata..

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.

Univalent :: Univalent (a.) Having a valence of one; capable of combining with, or of being substituted for, one atom of hydrogen; monovalent; -- said of certain atoms and radicals..

Monobasic :: Monobasic (a.) Capable of being neutralized by a univalent base or basic radical; having but one acid hydrogen atom to be replaced; -- said of acids; as, acetic, nitric, and hydrochloric acids are monobasic..

Tulip-shell :: Tulip-shell (n.) A large, handsomely colored, marine univalve shell (Fasciolaria tulipa) native of the Southern United States. The name is sometimes applied also to other species of Fasciolaria..

Buccinum :: Buccinum (n.) A genus of large univalve mollusks abundant in the arctic seas. It includes the common whelk (B. undatum).

Columbella :: Columbella (n.) A genus of univalve shells, abundant in tropical seas. Some species, as Columbella mercatoria, were formerly used as shell money..

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

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

Labrum :: Labrum (n.) The external margin of the aperture of a shell. See Univalve.

Nival :: Nival (a.) Abounding with snow; snowy.

Mollusca :: Mollusca (n. pl.) One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and Lamellibranchiata, or Conchifera. These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or m

Concho-spiral :: Concho-spiral (n.) A kind of spiral curve found in certain univalve shells.

Formyl :: Formyl (n.) A univalent radical, H.C:O, regarded as the essential residue of formic acid and aldehyde..

Beak :: Beak (n.) The prolongation of certain univalve shells containing the canal.

Lip :: Lip (n.) One of the edges of the aperture of a univalve shell.

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

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

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