Shell subspherical, smooth, with a half (ventral) sagittal stricture, and a nearly complete internal ring. Pores very numerous and small, circular. No larger annular pores. Basal plate with three large collar pores (the sternal odd pore apparently divided into two jugular pores by the visible free procolumella.) (Compare _Circospyris gigas_, p. 1072 = _Dictyospyris gigas_, Ehrenberg). _Dimensions._--Shell 0.1 long, 0.14 broad. _Habitat._--Fossil in Barbados. Subgenus 3. _Dictyospyrissa_, Haeckel. _Definition._--Basal plate with four large collar pores (two larger posterior cardinal and two smaller anterior jugular pores). 8. _Dictyospyris fenestra_, Ehrenberg. Dictyospyris fenestra, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 68, Taf. xix. fig. 11. Shell nearly cubical, smooth, without external sagittal stricture. Internal sagittal ring complete. Pores small, roundish; on each side of the ring two crossed pairs of large, square, equal, annular pores. Basal plate also with four longer pores of nearly equal size. _Dimensions._--Shell 0.05 long, 0.07 broad. _Habitat._--Fossil in Barbados. 9. _Dictyospyris tetrastoma_, Ehrenberg. _Dictyospyris tetrastoma_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, Taf. xix. fig. 12. Shell nut-shaped, tuberculate, with slight sagittal stricture. Pores numerous, irregular, roundish. No larger annular pores. Basal plate with four large ovate collar pores (the two cardinal twice as large as the two jugular pores). _Dimensions._--Shell 0.05 long, 0.07 broad. _Habitat._--Cosmopolitan; Atlantic, Indian, Pacific; also fossil in Barbados and Sicily. 10. _Dictyospyris spinulosa_, Ehrenberg. Dictyospyris spinulosa, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, Taf. xix. fig. 13. ? _Ceratospyris borealis_, Bailey, 1856, Amer. Journ. of Science and Arts, vol. xxii. pl. i. fig. 3. Shell nut-shaped, spinulate, without external stricture, with an internal free sagittal ring. Pores numerous, irregular, roundish; on each side of the ring two pairs of very large square pores. Basal plate with four large collar pores. {1076}_Dimensions._--Shell 0.07 long, 0.08 broad. _Habitat._--Central Pacific, Stations 271 to 274, depth 2350 to 2750 fathoms; also fossil in Barbados. 11. _Dictyospyris mammillaris_, n. sp. (Pl. 89, figs. 9, 10). Shell mammillate, nut-shaped, with deep sagittal stricture. Mammillæ of the surface hemispherical, with a conical apex. Pores not numerous, large, roundish. Two pairs of large pores on each side of the ring. Basal plate with four large pores. _Dimensions._--Shell 0.06 long, 0.08 broad. _Habitat._--Western Tropical Pacific, Station 225, depth 4475 fathoms. 12. _Dictyospyris anthophora_, n. sp. (Pl. 89, fig. 8).