8. Xiphostylus trochilus, n. sp. (Pl. [13], fig. 10).
Pores regular, circular, four times as broad as the bars; eight to nine on the half equator. Polar spines cylindrical, the major somewhat longer than the axis of the sphere, the minor shorter, surrounded by a group of from four to eight shorter conical spines. Surface of the opposite hemisphere smooth, without by-spines.
Dimensions.—Diameter of the sphere 0.07 to 0.08, pores 0.01, bars 0.0025.
Habitat.—North Pacific, Station 244, depth 2900 fathoms.
9. Xiphostylus picus, n. sp. (Pl. [14], fig. 13).
Lithomespilus picus, Haeckel, 1881, Prodrom. et Atlas.
Pores regular, circular, twice as broad as the bars; sixteen to eighteen on the half equator. Polar spines cylindrical, conical at the apex, the major once and a half to twice as long as the diameter of the shell, the minor scarcely half so long; around the latter a group of twelve to twenty shorter conical spines, irregularly scattered. Surface of the other hemisphere smooth.
Dimensions.—Diameter of the sphere 0.13, pores 0.006, bars 0.003; length of the major polar spine 0.2 to 0.24, of the minor 0.08 to 0.09, basal breadth 0.02.
Habitat.—Central Pacific, Station 265, depth 2900 fathoms.