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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

Sea Lemon :: Sea lemon () Any one of several species of nudibranchiate mollusks of the genus Doris and allied genera, having a smooth, thick, convex yellow body..

Byssus :: Byssus (n.) A tuft of long, tough filaments which are formed in a groove of the foot, and issue from between the valves of certain bivalve mollusks, as the Pinna and Mytilus, by which they attach themselves to rocks, etc..

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

Radula :: Radula (n.) The chitinous ribbon bearing the teeth of mollusks; -- called also lingual ribbon, and tongue. See Odontophore..

Lim Naea :: Lim naea (n.) A genus of fresh-water air-breathing mollusks, abundant in ponds and streams; -- called also pond snail..

Siphonata :: Siphonata (n. pl.) A tribe of bivalve mollusks in which the posterior mantle border is prolonged into two tubes or siphons. Called also Siphoniata. See Siphon, 2 (a), and Quahaug..

Tooth :: Tooth (n.) Any hard calcareous or chitinous organ found in the mouth of various invertebrates and used in feeding or procuring food; as, the teeth of a mollusk or a starfish..

Multivalve :: Multivalve (n.) Any mollusk which has a shell composed of more than two pieces.

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

Atlanta :: Atlanta (n.) A genus of small glassy heteropod mollusks found swimming at the surface in mid ocean. See Heteropod.

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..

Tube :: Tube (n.) One of the siphons of a bivalve mollusk.

Asiphonida :: Asiphonida (n. pl.) A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks..

Tectibranchiate :: Tectibranchiate (n.) A tectibranchiate mollusk.

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..

Prosobranchiata :: Prosobranchiata (n. pl.) The highest division, or subclass, of gastropod mollusks, including those that have the gills situated anteriorly, or forward of the heart, and the sexes separate..

Asiphonate :: Asiphonate (n.) An asiphonate mollusk.

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

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

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