Habitat.—South Pacific, Station 298, depth 2225 fathoms.
6. Lithostrobus hexastichus, n. sp. (Pl. [80], fig. 15).
Shell campanulate-conical, smooth, with straight axis, and six to eight slight strictures. All joints nearly of the same length, the sixth joint twice as broad as the second. In each joint six transverse rows of subregular, hexagonal pores, with thin bars. Horn of the cephalis conical, straight, of about the same length. (The specimen figured is a somewhat irregular one; other specimens found afterwards were perfectly conical and regular, with joints of equal length).
Dimensions.—Length of the shell (with six joints) 0.16, of each joint 0.027.
Habitat.—Central Pacific, Station 270 to 274, depth 2350 to 2925 fathoms.
Subgenus 2. Cornustrobus, Haeckel.
Definition.—Shell horn-shaped, conical, with curved axis; all joints nearly equal in length, gradually increasing in breadth.
7. Lithostrobus cyrtoceras, n. sp. (Pl. [80], fig. 2).
Shell horn-shaped, conical, with curved axis, smooth, with six to eight deep strictures. All joints nearly of the same length, gradually increasing in breadth; the sixth joint twice as broad as the second. In each joint about four transverse series of regular circular pores. Horn of the cephalis conical, slightly curved, of the same length.
Dimensions.—Length of the curved axis of the shell (with eight joints) 0.24, length of each joint 0.03; breadth of the second joint 0.04, of the sixth 0.08.