1. Stylostaurus caudatus, n. sp. (Pl. [13], fig. 7).
Shell thick walled, smooth, with regular, circular, hexagonally framed pores, twice as broad as the bars; five to six on the quadrant. Spines three-sided pyramidal, as broad at the base as one mesh; one of the spines longer than the shell diameter, the opposite spine nearly as long as the shell radius; both lateral spines scarcely one-third as long.
Dimensions.—Diameter of the shell 0.1, pores 0.01, bars 0.005; length of the major spine 0.14, of the opposite 0.04, of both lateral spines 0.012.
Habitat.—Central Pacific, Station 266, depth 2750 fathoms.
2. Stylostaurus gladiatus, n. sp.
Shell thick walled, smooth, with regular, circular pores, three times as broad as the bars; nine to ten on the quadrant. Spines three-sided prismatic, as broad at the base as one mesh; one of the spines longer than the shell diameter, and much larger than the other three, which are nearly equal (half as long as the radius).
Dimensions.—Diameter of the shell 0.2, pores 0.015, bars 0.005; length of the major spine 0.25, of the three others 0.005.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.
Subfamily Staurolonchida,[[86]] Haeckel, 1881, Prodromus, pp. 449, 451.
Definition.—Staurosphærida with two concentric spherical lattice-shells.