Source : Webster's Revised Unabridged Dictionary (1913)

Marsipobranchia \Mar"si*po*bran"chi*a\, n. pl. [NL., fr. Gr. ? a
   pouch + ? a gill.] (Zo["o]l.)
   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}.