Dimensions.—Diameter of the shell 0.15; pores 0.008, bars 0.002; length of the spines 0.02 to 0.03, basal breadth 0.005.
Habitat.—Indian Ocean, Zanzibar, Pullen; Madagascar, Rabbe.
14. Hexastylus chilonis, n. sp.
Shell thin walled, covered with numerous bristle-shaped spines (as long as the radius). Pores regular, circular, twice as broad as the bars; eight to nine on the radius. Six main spines triangular pyramidal, with straight edges, as long as the diameter of the shell, as broad as two pores.
Dimensions.—Diameter of the shell 0.2, pores 0.02, bars 0.01; length of the spines 0.2, basal breadth 0.05.
Habitat.—South Atlantic, Station 325, surface.
15. Hexastylus cleobuli, n. sp.
Shell thick walled, covered with numerous short, conical spines (twice as large as one pore). Pores regular, circular, of the same breadth as the bars; twelve to thirteen on the radius. Six main spines conical, as long as the radius, three times as broad as one pore.
Dimensions.—Diameter of the shell 0.24, pores and bars 0.005; length of the spines 0.12, basal breadth 0.016.
Habitat.—South Pacific, Station 300, depth 1375 fathoms.