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Of or pertaining to the Nudibranchiata. -- n.

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.

Same as Nudibranch.

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.

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

A group of nudibranch mollusks.

A group of nudibranch mollusks without special gills.

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

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

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.

oring (Carp.), the timberwork which supports a floor. Gwilt. -- Naked mollusk (Zoöl.), a nudibranch. -- Naked wood (Bot.), a large rhamnaceous tree (Colibrina reclinata) of Southern Florida and the West Indies, having a hard and heavy heartwood, which takes a fine polish. C. S. Sargent.

A division of nudibranchiate mollusks having gills upon the back.

breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.

A division of Nudibranchiata, in which the mantle itself serves as a gill.

A division of Nudibranchiata including those which have numerous branchiæ on the back.

One of the two 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 genus of oceanic nudibranchiate mollusks having the small branched gills situated on the upper side of four fleshy lateral lobes, and on the median caudal crest.

Any one of several species of nudibranchiate mollusks of the genus Doris and allied genera, having a smooth, thick, convex yellow body.

A nudibranch mollusk.

- used in spacing out pages and to separate display lines, etc. Sea slug. (Zoöl.) (a) Any nudibranch mollusk. (b) A holothurian. -- Slug caterpillar. Same as Slugworm.