(Haeckel, 1879)
Umbrella 16 mm wide, hemispherical; manubrium short, urn-shaped; 4 simple lips; 4 spindle-shaped gonads on distal half of radial canals; 8-16 marginal tentacles with large bulbs, flanked by 5-7 pairs of lateral spiral cirri; 3-5 rudimentary marginal warts between successive tentacles; about 16 statocysts.