Dimensions.—Shell 0.08 long, 0.06 broad; horn 0.04 long, feet 0.06 to 0.09 long.
Habitat.—Central Pacific, Station 266, depth 2750 fathoms.
5. Peridium palmipes, n. sp. (Pl. [53], fig. 10).
Shell ovate, smooth, with irregular roundish pores. Basal plate with three large pores. Horn oblique, three-sided pyramidal, about as long as the shell, inserted near its occipital base. Three feet prismatic, slender, half as long, ending with a broad dentate plate.
Dimensions.—Shell 0.06 long, 0.05 broad; horn 0.05 long, feet 0.03 long.
Habitat.—Western Tropical Pacific, Station 224, depth 1850 fathoms.
6. Peridium alatum, n. sp. (Pl. [97], fig. 7).
Shell subspherical smooth, with regular circular, hexagonally-framed pores. Basal plate with nine pores (three larger central and six smaller distal pores). Horn apical, of equal size and the same form as the three feet, three-sided prismatic, with three broad prominent wings, somewhat longer than the shell.
Dimensions.—Shell 0.07 long, 0.08 broad; horn and feet 0.1 to 0.12 long.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.