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A division of chætopod annelids in which the branchiæ are along the back, on each side, or on the parapodia. [See Illusts. under Annelida and Chætopoda.]

Having branchiæ along the back; belonging to the Dorsibranchiata. -- n.

Of or pertaining to Elasmobranchii. -- n.

Pertaining to the segment between the ceratobranchial and pharyngobranchial in a branchial arch. -- n.

Outside of the branchial arches; -- said of the cartilages thus placed in some fishes.

An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera. -- Hy`dro*bran"chi*ate, a.

Pertaining to the segment between the basibranchial and the ceratobranchial in a branchial arch. -- n.

One of the Inferobranchiata.

A suborder of marine gastropod mollusks, in which the gills are between the foot and the mantle.

he gills on the sides of the body, under the margin of the mantle; belonging to the Inferobranchiata.

Below the gills; -- applied to the ventral portion of the pallial chamber in the lamellibranchs.

Between the branchiæ.

A class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc.

Having lamellar gills; belonging to the Lamellibranchia. -- n.

Of or pertaining to the Lophobranchii.

. It includes the lampreys and hagfishes. See Cyclostoma, and Lamprey. Called also Marsipobranchiata, and Marsipobranchii.

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.