L. Agassiz, 1862
Exumbrella with 5 meridian cnidocysts tracks; 1 tentacular bulb with 1 or more moniliform tentacles and with medusa buds. Umbrella 3 mm wide, 4 mm high, bell-shaped, umbrella margin oblique; 2 meridian cnidocyst tracks issuing from tentacular bulb, 1 track of each 3 reduced non-tentacular bulb; manubrium large, cylindrical, mounted on short peduncle; gonads completely surrounding manubrium; eggs developing in actinulae.