(Agassiz and Mayer, 1899)
Umbrella dome-like, without apical projection, up to 7 mm wide, 11 mm high, with thick walls; manubrium half as long as bell cavity, cross-shaped in transverse section; mesenteries very long; gonads adradial; 4 slightly crenulated lips; 8-12 long marginal tentacles and 24-36 rudimentary tentacles, all with ocelli.