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Having the gills protected by a shieldlike shell; of or pertaining to the Scutibranchiata. -- n.

Having a siphon, or siphons, to convey water to the gills; belonging or pertaining to the Siphonobranchiata. -- n.

A tectibranchiate mollusk.

Of or pertaining to the Tetrabranchiata. -- n.

Having the gills situated upon the neck; -- said of certain mollusks.

Having but one gill, as certain molluscs.

Of or pertaining to the Zygobranchia.

Abranchiate.

A division of nudibranchiate Mollusca, in which the gills form a wreath or cluster upon the posterior part of the back. See Nudibranchiata, and Doris.

Having gills; branchiate; as, branchiferous gastropods.

The state of being made up of branchiate segments. R. Wiedersheim.

A group of nudibranchiate Mollusca having on the back papilliform or branched organs serving as gills.

ulated suckers, by means of which it secures its prey. The name is sometimes applied to dibranchiate cephalopods generally.

A division of the dibranchiate cephalopods including the cuttlefishes and squids. See Decacera.

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

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

A genus of nudibranchiate mollusks, found in the warmer latitudes, swimming in the open sea. These mollusks are beautifully colored with blue and silvery white.

One of a family of fresh-water pectinibranchiate mollusks, having a turret-shaped shell.

The only existing genus of tetrabranchiate cephalopods. About four species are found living in the tropical Pacific, but many other species are found fossil. The shell is spiral, symmetrical, and chambered, or divided into several cavities by simple curved partitions, which are traversed and connected together by a con…

A division of nudibranchiate mollusks having gills upon the back.