2. Hexastylus sapientum, n. sp.
Shell thin walled, with smooth surface. Pores regular, hexagonal, eight to ten times as broad as the bars; six to seven on the radius. Six spines bristle-shaped, longer than the diameter of the shell. (Lattice-work and spines similar to those of Heliosphæra actinota, Monogr. d. Radiol., Taf. ix. fig. 3.)
Dimensions.—Diameter of the shell 0.15, pores 0.016, bars 0.002; length of the spines 0.2, breadth 0.002.
Habitat.—North Atlantic, Station 354, surface.
3. Hexastylus thaletis, n. sp. (Pl. [21], fig. 4).
Shell thin walled, with smooth surface. Pores subregular, circular, hexagonally framed, somewhat funnel-shaped, of the same breadth as the bars; eight to nine on the radius. Six spines triangular pyramidal, with prominent edges, as long as the radius, three to four times as broad at the base as one pore.
Dimensions.—Diameter of the shell 0.1, pores and bars 0.005; length of the spines 0.05, basal breadth 0.02.
Habitat.—Tropical Pacific, Station 225, depth 4575 fathoms.
4. Hexastylus favosus, n. sp.
Shell thick walled, with smooth surface. Pores regular, circular, hexagonally framed, deep funnel-shaped, of the same breadth as the bars; six to seven on the radius. Six spines triangular pyramidal, as long as the diameter, twice as broad at the base as one pore.