Dimensions.—Diameter of the shell 0.12, of the pores 0.008, bars 0.002.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.
2. Staurosphæra christiana, n. sp.
Shell thick walled, smooth, with regular, circular, hexagonally framed pores, three times as broad as the bars; six to eight on the quadrant. Four crossed spines six-sided pyramidal, as long as the radius, as broad as one mesh.
Dimensions.—Diameter of the shell 0.13, pores 0.012, bars 0.004.
Habitat.—Central Pacific, Station 268, depth 2900 fathoms.
3. Staurosphæra johannis, n. sp.
Shell thick walled, smooth, with regular, circular pores, four times as broad as the bars; five to six on the quadrant. Four spines six-sided pyramidal, half as long as the radius, as broad as one mesh.
Dimensions.—Diameter of the shell 0.15, pores 0.02, bars 0.005.
Habitat.—North Pacific, Station 241, depth 2300 fathoms.