Antedon with arms to ~50 mm long. Cirri to 40, of 16-18 cirrals; length to ~25% arm length; longer proximal cirrals with L/W ratio 2.0-2.5; distal cirrals distinctly
longer than wide and only slightly wider than proximal cirrals. P1 with 20-25 segments, at least twice as long as P2; P2 and P3 similar.
to P3 ; there are often calcareous patches in the perisome between the division series.
Clark AH, Clark AM (1967) A monograph of the existing crinoids 1(5). Bulletin of the United States National Museum (82):1-860.