_Ceratospyris mystax_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. fig. 6. Shell elliptical spinulate, with slight collar stricture and large subregular circular pores. Basal plate with three pores (?) Horn small conical, oblique, shorter than the shell. Feet slender conical, longer than the shell, slightly curved, divergent. At the base of the columella, between the two feet, a small rudiment of the last caudal foot is visible. _Dimensions._--Shell 0.06 long, 0.1 broad; horn 0.02, feet 0.12 long. _Habitat._--Fossil in Barbados. 3. _Dipospyris cubus_, n. sp. (Pl. 83, fig. 18). Shell box-shaped, subcubical, papillate, without external sagittal stricture, with numerous subregular circular pores. Basal plate with three very large collar pores, surrounded by a circle of smaller pores. Apical horn short and thick, scarcely half as long as the shell. Feet of the same form, longer than the shell, widely divergent. _Dimensions._--Shell 0.08 long, 0.11 broad; horn 0.03 long, feet 0.14 long. _Habitat._--Central Pacific, Station 272, depth 2600 fathoms. {1037}4. _Dipospyris chelifer_, n. sp. (Pl. 85, fig. 3). Shell elliptical, compressed, nodose, with deep sagittal stricture and irregular roundish pores. Basal plate with three pores (?). Apical horn stout, conical, twice to four times as long as the shell (often much longer than in the figured specimen). Feet scarcely longer then the shell, cylindrical, slightly curved towards one another. _Dimensions._--Shell 0.08 long, 0.12 broad; horn 0.2 to 0.3 long, feet 0.1 to 0.15 long. _Habitat._--Central Pacific, Station 268, depth 2900 fathoms. 5. _Dipospyris irregularis_, n. sp. Pl. 85, fig. 2. Shell subspherical, without external sagittal stricture, with small circular pores. Basal plate with four pores. Apical horn small, conical, shorter than the shell. Feet three to four times as long as the shell, cylindrical, irregularly curved, very variable in size and form. _Dimensions._--Shell 0.08 long, 0.1 broad; horn 0.02 to 0.04 long, feet 0.2 to 0.3 long. _Habitat._--Central Pacific, Stations 266 to 268, depth 2700 to 2900 fathoms. 6. _Dipospyris sigmopodium_, n. sp. Shell violin-shaped, thorny, with deep sagittal stricture and irregular roundish pores. Basal plate with four collar pores. Horn straight, conical, about as long as the shell. Feet twice as long, cylindrical, markedly divergent, S-shaped, curved. _Dimensions._--Shell 0.08 long, 0.12 broad; horn 0.06 long, feet 0.2 long. _Habitat._--Tropical Atlantic, Station 348, depth 2450 fathoms; also fossil in Barbados. 7. _Dipospyris forcipata_, n. sp. (Pl. 85, fig. 1).