Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
4. Tripilidium ovatum, n. sp.
Shell ovate, smooth, one and one half times as long as broad. Pores regular, circular, as broad as the bars. Mouth constricted, half as broad as the shell. Horn short, conical. Three feet conical, curved, convergent, scarcely one-third as long as the shell.
Dimensions.—Shell 0.15 long, 0.11 broad; horn 0.02 long, feet 0.04 long.
Habitat.—South Atlantic, Station 332, depth 2200 fathoms.
5. Tripilidium clavatum, n. sp.
Shell nearly spherical, tuberculate, a little broader than long. Pores regular, circular, as broad as the bars. Mouth constricted, half as broad as the shell. Apical feet and the three divergent feet of equal size and similar form, about as long as the shell, straight, in the basal half smooth, cylindrical, in the distal half club-shaped, dimpled. (Very similar to Tripospyris conifera and Tripospyris eucolpos, Pl. [84], figs. 7 and 4; but the spherical shell exhibits no trace of sagittal ring or constriction, and the simple shell-cavity has a wide open mouth, and is not closed by a basal plate.)
Dimensions.—Shell 0.1 diameter, horn and feet 0.08 to 0.09 long.
Habitat.—Central Pacific, Station 268, depth 2900 fathoms.
6. Tripilidium costatum, n. sp. (Pl. [98], figs. 8, 8a, 8b).