- 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.
Definition
[ n. pl.]