(Mayer, 1900)
Umbrella 14-20 mm wide, 6-8 mm high; subhemispherical; manubrium flask-shaped; 4 short, slightly folded lips; typically 4 radial canals, sometimes up to 10 but then asymmetrically arranged; gonads linear on distal half of radial canals; 16-36 tentacles, with large, conical marginal bulbs; generally 1-3 rudimentary tentacle bulbs between each pair of tentacles, middle one the largest; all marginal bulbs with excretory papillae; with 4-6 statocysts between successive tentacles.