Shell thin walled, covered with bristle-shaped by-spines, as long as the radius. Pores regular, circular, twice as broad as the bars; six to eight on the quadrant. Four main spines cylindrical, five to ten times as long as the radius, as broad as one mesh.
Dimensions.—Diameter of the shell 0.08, pores 0.006, bars 0.003.
Habitat.—Central Pacific, Station 272, surface.
9. Staurosphæra andreæ, n. sp.
Shell thick walled, with regular, circular, hexagonally framed pores, three times as broad as the bars; nine to ten on the quadrant. From each hexagon-corner arises a bristle-shaped by-spine, half as long as the radius. Four main spines three-sided pyramidal, with spirally contorted edges, as long as the radius (very similar to Hexastylus solonis, Pl. [21], fig. 11, but with only four spines).
Dimensions.—Diameter of the shell 0.16, pores 0.01, bars 0.003.
Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
10. Staurosphæra thomæ.
Shell thick walled, with regular, circular pores, twice as broad as the bars; twelve to fourteen on the quadrant; surface covered with short conical by-spines. Four main spines conical, twice as long as the radius, twice as broad as one mesh.
Dimensions.—Diameter of the sphere 0.2, pores 0.012, bars 0.006.