Ophiomusium ligatum Koehler, 1922 .

Figures 17 a, b

Holotype USNM E80, Albatross Station 5445, east coast of Luzon, Philippines 700m; 2 paratypes E81, Station 5650, Gulf of Boni, Celebes, 987m.

Main Features: Koehler’s illustrated type is 22 mm d.d. with the longest arm 85 mm. Disc plates are small and circular, non-imbricating and slightly swollen. Three long plates in the interradii are surrounded by a bead-like belt of smaller plates. Large, coarsely rugose radial shields. A cluster of small plates at the dorsal base of each arm. Two pairs of exposed tentacle pores with scales.