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Molluscoid :: Molluscoid (a.) Resembling the true mollusks; belonging to the Molluscoidea.

Fissurella :: Fissurella (n.) A genus of marine gastropod mollusks, having a conical or limpetlike shell, with an opening at the apex; -- called also keyhole limpet..

Turritella :: Turritella (n.) Any spiral marine gastropod belonging to Turritella and allied genera. These mollusks have an elongated, turreted shell, composed of many whorls. They have a rounded aperture, and a horny multispiral operculum..

Lusk :: Lusk (a.) Lazy; slothful.

Shell :: Shell (n.) The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like..

Neomenoidea :: Neomenoidea (n. pl.) A division of vermiform gastropod mollusks, without a shell, belonging to the Isopleura..

Borer :: Borer (n.) A marine, bivalve mollusk, of the genus Teredo and allies, which burrows in wood. See Teredo..

Circumesophagal :: Circumesophagal (a.) Surrounding the esophagus; -- in Zool. said of the nerve commissures and ganglia of arthropods and mollusks.

Pygobranchia :: Pygobranchia (n. pl.) A division of opisthobranchiate mollusks having the branchiae in a wreath or group around the anal opening, as in the genus Doris..

Testaceology :: Testaceology (n.) The science of testaceous mollusks; conchology.

Sea Clam :: Sea clam () Any one of the large bivalve mollusks found on the open seacoast, especially those of the family Mactridae, as the common American species. (Mactra, / Spisula, solidissima); -- called also beach clam, and surf clam..

Conus :: Conus (n.) A Linnean genus of mollusks having a conical shell. See Cone, n., 4..

Astarte :: Astarte (n.) A genus of bivalve mollusks, common on the coasts of America and Europe..

Acephalous :: Acephalous (a.) Without a distinct head; -- a term applied to bivalve mollusks.

Typhlosole :: Typhlosole (n.) A fold of the wall which projects into the cavity of the intestine in bivalve mollusks, certain annelids, starfishes, and some other animals..

Tunicata :: Tunicata (n. pl.) A grand division of the animal kingdom, intermediate, in some respects, between the invertebrates and vertebrates, and by some writers united with the latter. They were formerly classed with acephalous mollusks. The body is usually covered with a firm external tunic, consisting in part of cellulose, and having two openings, one for the entrance and one for the exit of water. The pharynx is usually dilated in the form of a sac, pierced by several series of ciliated slits, and se

Rhachis :: Rhachis (n.) The median part of the radula of a mollusk.

Notobranchiata :: Notobranchiata (n. pl.) A division of nudibranchiate mollusks having gills upon the back.

Auricula :: Auricula (n.) A genus of air-breathing mollusks mostly found near the sea, where the water is brackish.

Nudibranchiata :: Nudibranchiata (n. pl.) A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia..

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