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Tethys :: Tethys (n.) A genus of a large naked mollusks having a very large, broad, fringed cephalic disk, and branched dorsal gills. Some of the species become a foot long and are brilliantly colored..

Clamp :: Clamp (n.) A mollusk. See Clam.

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..

Nucleus :: Nucleus (n.) A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks..

Notobranchiata :: Notobranchiata (n. pl.) A division of nudibranchiate mollusks having gills upon the back.

Lithophagous :: Lithophagous (a.) Eating or destroying stone; -- applied to various animals which make burrows in stone, as many bivalve mollusks, certain sponges, annelids, and sea urchins. See Lithodomus..

Chiton :: Chiton (n.) One of a group of gastropod mollusks, with a shell composed of eight movable dorsal plates. See Polyplacophora..

Odontophore :: Odontophore (n.) 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..

Eolis :: Eolis (n.) A genus of nudibranch mollusks having clusters of branchial papillae along the back. See Ceratobranchia.

Shellfish :: Shellfish (n.) Any aquatic animal whose external covering consists of a shell, either testaceous, as in oysters, clams, and other mollusks, or crustaceous, as in lobsters and crabs..

Tube :: Tube (n.) One of the siphons of a bivalve mollusk.

Ostracea :: Ostracea (n. pl.) A division of bivalve mollusks including the oysters and allied shells.

Circumesophagal :: Circumesophagal (a.) Surrounding the esophagus; -- in Zool. said of the nerve commissures and ganglia of arthropods and mollusks.

Myaria :: Myaria (n. pl.) A division of bivalve mollusks of which the common clam (Mya) is the type.

Rhachis :: Rhachis (n.) The median part of the radula of a mollusk.

Atlanta :: Atlanta (n.) A genus of small glassy heteropod mollusks found swimming at the surface in mid ocean. See Heteropod.

Plate-gilled :: Plate-gilled (a.) Having flat, or leaflike, gills, as the bivalve mollusks..

Teredo :: Teredo (n.) A genus of long, slender, wormlike bivalve mollusks which bore into submerged wood, such as the piles of wharves, bottoms of ships, etc.; -- called also shipworm. See Shipworm. See Illust. in App..

Inclusa :: Inclusa (n. pl.) A tribe of bivalve mollusks, characterized by the closed state of the mantle which envelops the body. The ship borer (Teredo navalis) is an example..

Univalve :: Univalve (n.) A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs..

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