<i>Antedon</i> with P<sub>2</sub> stouter basally and two-thirds the length of P<sub>1</sub>, which has 18-20 segments. Cirri ~30, of up to 11 cirrals; longest cirrals with L/W ratio up to 5. Arms up to 40 mm long.
Clark AH, Clark AM (1967) A monograph of the existing crinoids 1(5). Bulletin of the United States National Museum (82):1-860.