Koehler 1920: 237; Fisher 1940: 121; A.M. Clark 1962: 22 (key); Bernasconi 1963: 23; H.E.S. Clark 1963: 43. Diagnosis. Body strongly stellate with elongate arms. Abactinal plates distinct, round to polygonal in outline. Abactinal and marginal plate surfaces bare, smooth. Peripheral granules, angular to polygonal-round flush with abactinal, marginal plate surfaces. Superomarginal plates abutting over midline in some individuals. Actinal surface bare or covered with angular, flattened granules. Pedicellariae absent.