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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..

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

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..

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

Clepsine :: Clepsine (n.) A genus of fresh-water leeches, furnished with a proboscis. They feed upon mollusks and worms..

Sedentary :: Sedentary (a.) Remaining in one place, especially when firmly attached to some object; as, the oyster is a sedentary mollusk; the barnacles are sedentary crustaceans..

Tubulibranchiata :: Tubulibranchiata (n. pl.) A group of gastropod mollusks having a tubular shell. Vermetus is an example.

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

Midas''s Ear :: Midas's ear () A pulmonate mollusk (Auricula, / Ellobium, aurismidae); -- so called from resemblance to a human ear..

Tube-shell :: Tube-shell (n.) Any bivalve mollusk which secretes a shelly tube around its siphon, as the watering-shell..

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

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..

Slug :: Slug (n.) Any one of numerous species of terrestrial pulmonate mollusks belonging to Limax and several related genera, in which the shell is either small and concealed in the mantle, or altogether wanting. They are closely allied to the land snails..

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..

Turnstone :: Turnstone (n.) Any species of limicoline birds of the genera Strepsilas and Arenaria, allied to the plovers, especially the common American and European species (Strepsilas interpres). They are so called from their habit of turning up small stones in search of mollusks and other aquatic animals. Called also brant bird, sand runner, sea quail, sea lark, sparkback, and skirlcrake..

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..

Veneracea :: Veneracea (n. pl.) An extensive tribe of bivalve mollusks of which the genus Venus is the type. The shells are usually oval, or somewhat heartshaped, with a conspicuous lunule. See Venus..

Saxicavous :: Saxicavous (a.) Boring, or hollowing out, rocks; -- said of certain mollusks which live in holes which they burrow in rocks. See Illust. of Lithodomus..

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

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