page 4

Typhlonarke Waite 1909 .

Disc sub-circular, its outline broken only by a notch under the tail. Eyes not discernible. Spiracles with entire edges. Tail short, with a slight lateral fold. Dorsal fin single. Anterior portion of ventrals modified for walking; posterior portion coalesced with the pectorals to form the hinder margin of the disc. Teeth confined to the anterior portion of the jaws, pavement-like, the hinder series with sharp cusps. Body naked.