Ophiomusium altum Koehler, 1904 .

Figure 3 a, b

Ophiomusium altum Koehler, 1904; H. L. Clark, 1939.

Syntypes (3) RMNH V.Ech. O.2045, Siboga Station 76, Makassar Straits, Indonesia, 2029 m. Other material examined: 1 specimen BMNH 1948 -5-26-16-364, Gulf of Aden, John Murray Expedition Station 26, 2312 m., 2 specimens BMNH 1948 -5-26-365, Zanzibar, John Murray Expedition station 118, 1789 m.

Main Features: Disc 5 mm diameter, inflated, highest point is the rosette plates and the central plate has a central prominence. There are 2 pairs of exposed tentacle pores with one scale on each. Arms are thin with long joints, carrying 4 small and closely set arm spines. A second, smaller specimen is with the holotype, but is not labelled as a type specimen.