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Having the form of a membrane or of parchment.

The science which treats of membranes.

Pertaining to, consisting of, or resembling, membrane; as, a membranous covering or lining.

A large aquatic American salamander of the genus Necturus, having permanent external gills.

Of or pertaining to a region of the carapace of a crab covering the middle branchial region.

Of or pertaining to the lobe of the carapace of crabs covering the posterior branchiæ.

A division of nudibranchiate mollusks having gills upon the back.

Of or pertaining to the Notobranchiata.

Belonging to the Nucleobranchiata. -- n.

See Heteropoda.

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.

Overhanging; as, obumbrant feathers.

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.

One of the Pectinibranchiata. Also used adjectively.

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