Ophiomusium morio Koehler, 1922 .

Figures 25 a, b

Holotype USNM 40993 Albatross station 5392 Between Samar and Masbate, Philippines, 246m.

Main Features: Rigid skeleton and stiff arms. Moderately large, slightly tumid disc plates and radial shields. The shields separated from one another by 3 elongated plates Three of the 5 oral shields split proximally. Unusual hoof-shaped genital slits. Dorsal arm plates throughout arm, only 2 ventral plates. Arm joints constricted. Two pairs of very small exposed tentacle pores, each with a single scale. Two small arm spines.