Habitat.—Western Tropical Pacific, Station 224, depth 1850 fathoms.
2. Stylartus bicuspis, n. sp.
Shell thin walled, smooth, with regular, circular pores, twice as broad as the bars; twelve to fourteen on the half equator of each chamber. Polar spines very stout, straight, three-sided pyramidal, half as long as the shell.
Dimensions.—Length of the shell 0.16, greatest breadth 0.12; length of the polar spines 0.08, basal thickness 0.025.
Habitat.—Pacific, central area. Station 266, depth 2750 fathoms.
Subgenus 2. Stylartura, Haeckel.
Definition.—On each pole of the main axis a bunch of several spines.
3. Stylartus palatus, n. sp.
Shell thick walled, thorny, with irregular, roundish pores, twice to three times as broad as the bars; fifteen to eighteen on the half equator of each chamber. On each pole of the main axis a large conical spine, surrounded by a group of ten to fifteen smaller spines, one-third to two-thirds as long as the breadth of the deep equatorial stricture.
Dimensions.—Length of the shell 0.14, greatest breadth 0.09; length of the polar spines 0.03 to 0.06, basal breadth 0.005 to 0.015.