WoRMS note details
stouter basally and two-thirds the length of P
, 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