(Quoy and Gaimard, 1827)
Umbrella 20 mm wide, somewhat less high, hemispherical, mesoglea thick, apex rounded; manubrium short, broad, cruciform, perradial edges of manubrium connected over entire length with subumbrella; mouth with 4 large, slightly crenulated lips; gonads in regular transverse folds on interradial walls of manubrium, extending outwards on perradii; 16-28 marginal tentacles; 2-3 minute cordyli-like appendages with distal bundle of cnidocysts between successive tentacles; cnidome microbasic euryteles.