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See Heteropoda.

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 gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.

Of or pertaining to the Opisthobranchiata. -- n.

Same as Brachiopoda.

Having the pallium, or mantle, acting as a gill, as in brachiopods.

A division of Gastropoda, including those that have a comblike gill upon the neck.

Having pectinated gills.

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

Those Batrachia which retain their gills through life, as the menobranchus.

ugh life; -- said especially of certain Amphibia, like the menobranchus. Opposed to caducibranchiate.

Surrounding the branchiæ; as, a peribranchial cavity.

ning to the pharynx and the branchiæ; -- applied especially to the dorsal elements in the branchial arches of fishes. See Pharyngeal. -- n.

A crustacean gill composed of lamellæ.

Same as Pleurobranch.

Same as Podobranch.

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

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 rudimentary branchia, or gill. -- Pseu`do*bran"chi*al, a.