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Any mollusk which has a shell composed of more than two pieces.

A genus of bivalve mollusks, including the common long, or soft-shelled, clam.

A division of bivalve mollusks of which the common clam (Mya) is the type.

To catch or seize suddenly or unexpectedly. [Colloq.] Smollett.

dusa. -- Naked flooring (Carp.), the timberwork which supports a floor. Gwilt. -- Naked mollusk (Zoöl.), a nudibranch. -- Naked wood (Bot.), a large rhamnaceous tree (Colibrina reclinata) of Southern Florida and the West Indies, having a hard and heavy heartwood, which takes a fine polish. C. S. Sargent.…

A mollusk, or shell, of the genus Nautilus or family Nautilidæ.

A division of vermiform gastropod mollusks, without a shell, belonging to the Isopleura.

Any mollusk of the genus Nerita.

A division of nudibranchiate mollusks having gills upon the back.

A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks.

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.

Hardened in feelings, esp. against moral or mollifying influences; unyielding; hard-hearted; stubbornly wicked. The very custom of evil makes the heart obdurate against whatsoever instructions to the contrary. Hooker. Art thou obdurate, flinty, hard as steel, Nay, more than flint, for stone at rain relenteth Shak.…

One of the cells which secrete the chitinous teeth of Mollusca.

A special structure found in the mouth of most mollusks, except bivalves. It consists of several muscles and a cartilage which supports a chitinous radula, or lingual ribbon, armed with teeth. Also applied to the radula alone. See Radula.

An egg case, especially those of many kinds of mollusks, and of some insects, as the cockroach. Cf. Ooecium.

Producing an operculum; -- said of the foot, or part of the foot, of certain mollusks.

A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.

Having the pulmonary sac situated posteriorly; -- said of certain air-breathing Mollusca.

The olfactory organ of some Mollusca. It is connected with the organ of respiration.

A division of bivalve mollusks including the oysters and allied shells.