(Forbes, 1846)
Marginal tentacles of uniform diameter, each with large terminal cnidocyst knob and 3 to 6 distinct rings of cnidocysts just above; middle part of radial canals with linear swellings. Umbrella up to 6 mm wide, 8 mm high, bell shaped, with globular apical chamber; gonads in 2 or more rings, leaving upper third free.