Dimensions.—Shell 0.1 to 0.15 long, 0.04 to 0.06 broad.
Habitat.—Central Pacific, Stations 265 to 274, surface, and at different depths.
2. Cornutella sethoconus, n. sp. (Pl. [54], fig. 10).
Shell slender, conical, with undulate outlines. Pores subregular, hexagonal, gradually increasing in size towards the mouth, in about fifteen to eighteen longitudinal series, in the upper part circular. Horn small, conical, short. The network is not so delicate as in the preceding similar species.
Dimensions.—Shell 0.12 to 0.16 long, 0.06 to 0.08 broad.
Habitat.—South Atlantic, Station 332, depth 2200 fathoms.
3. Cornutella distenta, Ehrenberg.
Cornutella distenta, Ehrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 287, Taf. vi. III. fig. 3.
Shell slender, conical, with straight outlines. Pores small, circular, regularly disposed in six to eight alternating longitudinal rows, each pore surrounded by a large rhombic frame. The connected frames form together a regular rhombic framework with obliquely crossed crests. Horn conical, stout, large.
Dimensions.—Shell 0.1 to 0.15 long, 0.04 to 0.06 broad.