_Habitat._--Central Pacific, Stations 265 to 268, depth 2700 to 2900 fathoms. 2. _Dictyospyris stalactites_, n. sp. (Pl. 89, fig. 7). Shell nut-shaped, covered with irregular ramified tubercles (like stalactites), with deep sagittal stricture. Pores not numerous, large, irregular, roundish. Two pairs of large triangular pores on each side of the ring (the inferior larger). Basal plate with two very large semicircular collar pores. _Dimensions._--Shell 0.07 long, 0.09 broad. _Habitat._--Central Pacific, Station 272, depth 2600 fathoms; also fossil in Barbados. {1074}3. _Dictyospyris biloba_, n. sp. Shell subspherical, tuberculate, with slight sagittal stricture. Pores very numerous, small, circular. No larger pores on either side of the ring. Basal plate with two very large circular pores, surrounded by a circle of smaller pores. _Dimensions._--Shell 0.07 long, 0.08 broad. _Habitat._--North Pacific, Station 253, depth 3125 fathoms. Subgenus 2. _Dictyospyrella_, Haeckel. _Definition._--Basal plate with three large collar pores (two paired posterior cardinal pores and an odd anterior sternal pore). 4. _Dictyospyris triomma_, n. sp. Shell nut-shaped, smooth, with deep sagittal stricture. Pores not numerous, large, polygonal roundish, two pairs of very large annular pores on each side of the ring. Basal plate with three large triangular pores. No free internal procolumella. _Dimensions._--Shell 0.06 long, 0.09 broad. _Habitat._--Indian Ocean, Zanzibar (Pullen), depth 2200 fathoms. 5. _Dictyospyris tristoma_, Ehrenberg. _Dictyospyris tristoma_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, Taf. xix. fig. 9. Shell nut-shaped, tuberculate, with slight sagittal stricture. Pores numerous, irregular, roundish. Three pairs of larger annular pores on each side of the ring. Basal plate with three large semi-circular pores (the sternal odd pore apparently halved by an internal free procolumella). _Dimensions._--Shell 0.05 long, 0.08 broad. _Habitat._--Fossil in Barbados and Sicily (Caltanisetta). 6. _Dictyospyris triloba_, Ehrenberg. _Dictyospyris triloba_, Ehrenberg, 1876, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, Taf. xix. fig. 8. Shell nut-shaped, spinulate, without external stricture, but with a complete internal sagittal ring. Pores numerous, subregular circular; no larger annular pores. Basal plate with three large, heart-shaped two-lobed collar pores. _Dimensions._--Shell 0.05 long, 0.07 broad. _Habitat._--Fossil in Barbados. {1075}7. _Dictyospyris gigas_, Bütschli. _Dictyospyris gigas_, Bütschli, 1880, Zeitschr. f. wiss. Zool., vol. xxxvi., p. 539, Taf. xxxii. fig. 14_a_, 14_b_.