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A genus of bivalve Mollusca which includes the true oysters.

-- Otter sheep. See Ancon sheep, under Ancon. -- Otter shell (Zoöl.), very large bivalve mollusk (Schizothærus Nuttallii) found on the northwest coast of America. It is excellent food, and is extensively used by the Indians. -- Sea otter. (Zoöl.) See in the Vocabulary.

Any marine bivalve mollusk of the genus Ostrea. They are usually found adhering to rocks or other fixed objects in shallow water along the seacoasts, or in brackish water in the mouth of rivers. The common European oyster (Ostrea edulis), and the American oyster (Ostrea Virginiana), are the most important species.…

Of or pretaining to a mantle, especially to the mantle of mollusks; produced by the mantle; as, the pallial line, or impression, which marks the attachment of the mantle on the inner surface of a bivalve shell. See Illust. of Bivalve. Pallial chamber (Zoöl.), the cavity inclosed by the mantle. -- Pallial sinus (Zoöl.)…

Any one of numerous species of freshwater pectinibranchiate mollusks, belonging to Paludina, Melantho, and allied genera. They have an operculated shell which is usually green, often with brown bands. See Illust. of Pond snail, under Pond.

h varying tints, found in the mantle, or between the mantle and shell, of certain bivalve mollusks, especially in the pearl oysters and river mussels, and sometimes in certain univalves. It is usually due to a secretion of shelly substance around some irritating foreign particle. Its substance is the same as nacre, or…

Any species of bivalve mollusks of the genus Pecten, and numerous allied genera (family Pectinidæ); a scallop. See Scallop.

or to feet, literally or figuratively; specifically (Zoöl.), pertaining to the foot of a mollusk; as, the pedal ganglion.

in; to sweat; to excrete through pores. Firs . . . perspire a fine balsam of turpentine. Smollett.

Any one of numerous species of marine bivalve mollusks of the genus Pholas, or family Pholadidæ. They bore holes for themselves in clay, peat, and soft rocks.

presentation of the dead Christ, attended by the Virgin Mary or by holy women and angels. Mollett.

The dove's-foot geranium (Geranium molle).

Any species of Pinna, a genus of large bivalve mollusks found in all warm seas. The byssus consists of a large number of long, silky fibers, which have been used in manufacturing woven fabrics, as a curiosity.

A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura.

Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form.

Having flat, or leaflike, gills, as the bivalve mollusks.

Having the courage given by drink. Smollett.

The anterior portion of the foot of a mollusk.

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.

A division of pulmonate mollusks having the breathing organ situated on the neck, as in the common snail.