12. Xiphostylus alca, n. sp. (Pl. [13], fig. 13).
Pores irregular, roundish, two to six times as broad as the bars; six to eight on the half equator. Each pore with three to six lobes, composed of three to six confluent smaller pores. Surface smooth. Major spine conical, curved, somewhat longer than the axis of the sphere; minor spine somewhat shorter, pommel-like, edged.
Dimensions.—Diameter of the sphere 0.07, pores 0.01 to 0.02, bars 0.003; length of the major spine 0.08, of the minor 0.06, basal thickness 0.02.
Habitat.—Indian Ocean, Sunda Strait, Rabbe, surface.
13. Xiphostylus edolius, n. sp. (Pl. [13], fig. 5).
Pores irregular, roundish, composed of two to six smaller confluent pores. On the half equator six to eight large pores, and twenty to thirty small pores; bars between the smaller very thin. Surface a little rough. Major polar spine conical, S-shaped, about twice as long as the axis of the shell; minor spine pommel-shaped, edged, scarcely as long as its radius.
Dimensions.—Diameter of the sphere 0.12, large pores 0.01 to 0.03, small pores 0.004 to 0.008, bars 0.001 to 0.004; length of the major spine 0.2, of the minor 0.05, basal breadth 0.02.
Habitat.—Central Pacific, Station 273, surface.
Subgenus 4. Xiphostylomma, Haeckel.
Definition.—Pores of the spherical shell irregular, of different size or form; surface thorny or spiny.