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arying 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 mot…

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

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

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.

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.

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.

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.

Containing remains of the earliest discovered life of the globe, which included mollusks, radiates and protozoans.

A division of gastropod mollusks having the teeth of the radula arranged in long transverse rows, somewhat like the barbs of a feather.

A division of opisthobranchiate mollusks having the branchiæ in a wreath or group around the anal opening, as in the genus Doris.

The chitinous ribbon bearing the teeth of mollusks; -- called also lingual ribbon, and tongue. See Odontophore.

Of or pertaining to the rhachis; as, the rhachidian teeth of a mollusk.

The median part of the radula of a mollusk.

wo tentacle-like organs on the back of the head or neck of a nudibranch or tectibranch mollusk. They are usually retractile, and often transversely furrowed or plicate, and are regarded as olfactory organs. Called also dorsal tentacles. See Illust. under Pygobranchia, and Opisthobranchia.

A division of gastropod mollusks having a large number of long, divergent, hooklike, lingual teeth in each transverse row. It includes the scutibranchs. See Illustration in Appendix.

is) having a spine on the nose. -- River limpet (Zoöl.), a fresh-water, air-breathing mollusk of the genus Ancylus, having a limpet-shaped shell. -- River pirate (Zoöl.), the pike. -- River snail (Zoöl.), any species of fresh-water gastropods of Paludina, Melontho, and allied genera. See Pond snail, under Pond. --…

The snout of a gastropod mollusk. See Illust. of Littorina.