(Forbes and Goodsir, 1851)
With 2 or 4 marginal tentacles. Umbrella up to 13 mm wide, almost hemispherical, mesoglea thick; with very long, narrow gastric peduncle extending far beyond bell margin and with small conical base; manubrium short; mouth with 4 small, simple lips; 2-4 (sometimes more) long perradial tentacles and 40-80 or more marginal warts usually all with lateral cirri; 8 statocysts