Ceto Gistel, 1848

Diagnosis (see Pawson 1971b). Five conspicuous radial oral valves. Five or more inconspicuous anal valves. Numerous tube feet on sole in all 3 radii and scattered interradially. Dorsal scales large and covered with leathery skin. Dorsal tube feet scattered through and between scales, and visible as pores. 15 tentacles. More than 25 Polian vesicles.