Mar"si*po*branch` (?), n. (Zoöl.) One of the Marsipobranchia.
||Mar"si*po*bran"chi*a (?), n. pl. [NL., fr. Gr. &?; a pouch + &?; a
||gill.] (Zoöl.) A class of Vertebrata, lower than fishes,
||characterized by their purselike gill cavities, cartilaginous
||skeletons, absence of limbs, and a suckerlike mouth destitute of
||jaws. It includes the lampreys and hagfishes. See Cyclostoma, and
||Lamprey. Called also Marsipobranchiata, and Marsipobranchii.