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the esophagus; -- in Zool. said of the nerve commissures and ganglia of arthropods and mollusks.

A bivalve mollusk of many kinds, especially those that are edible; as, the long clam (Mya arenaria), the quahog or round clam (Venus mercenaria), the sea clam or hen clam (Spisula solidissima), and other species of the United States. The name is said to have been given originally to the Tridacna gigas, a huge East Indi…

A mollusk. See Clam. [Obs.] Clamp nails, nails used to fasten on clamps in ships.

A genus of freshwater leeches, furnished with a proboscis. They feed upon mollusks and worms.

A bivalve mollusk, with radiating ribs, of the genus Cardium, especially C. edule, used in Europe for food; -- sometimes applied to similar shells of other genera.

A ringlike part of a mollusk in connection with esophagus.

A Linnean genus of mollusks having a conical shell. See Cone, n., 4.

A group of nudibranch mollusks.

A genus of mollusks, including the cowries. See Cowrie.

A marine mollusk of the genus Dentalium, with a curved conical shell resembling a tooth. See Dentalium.

A genus of marine mollusks belonging to the Scaphopoda, having a tubular conical shell.

A group of nudibranch mollusks without special gills.

An order of lamellibranchiate mollusks having an anterior and posterior adductor muscle, as the common clam. See Bivalve.

A subclass of gastropod mollusks in which the sexes are separate. It includes most of the large marine species, like the conchs, cones, and cowries.

A genus of large univalve mollusks, including the partridge shell and tun shells.

A genus of nudibranchiate mollusks having a wreath of branchiæ on the back.

eaf person. -- Ear vesicle (Zoöl.), a simple auditory organ, occurring in many worms, mollusks, etc. It consists of a small sac containing a fluid and one or more solid concretions or otocysts. -- Rose ear (in dogs), an ear which folds backward and shows part of the inside. -- To give ear to, to listen to; to heed,…

A genus of nudibranch mollusks having clusters of branchial papillæ along the back. See Ceratobranchia. [Written also Æolis.]

A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or æstivation.

A large division of gastropod molluske, including the Pulmonifera and Opisthobranchiata.