Shell tuberculate, nut-shaped, nearly cubical, without external sagittal strictures. Pores not numerous, large, polygonally roundish. Bars between them compressed, elevated, with large, campanulate or flower-like tubercles on the nodal points. Basal plate with four large pores. _Dimensions._--Shell 0.07 long, 0.09 broad. _Habitat._--North Atlantic, Station 349, depth 2450 fathoms. 13. _Dictyospyris quadriloba_, n. sp. Shell nut-shaped, smooth, with deep sagittal stricture. Pores numerous, small, circular, on each side of the ring three to four times as large as on the lateral sides. Basal plate with four very large collar pores and a circle of twenty to twenty-five very small peripheral pores. _Dimensions._--Shell 0.08 long, 0.11 broad. _Habitat._--Central Pacific, Stations 270 to 274, depth 2350 to 2925 fathoms. 14. _Dictyospyris messanensis_, J. Müller. _Dictyospyris messanensis_, J. Müller, 1858, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 46, Taf. ii. fig. 8. _Dictyospyris messanensis_, Haeckel, 1862, Monogr. d. Radiol., p. 291. Shell nut-shaped, spinulate, with deep sagittal stricture. Pores numerous and small, irregular roundish. No larger annular pores on the sides of the ring. Basal plate with four large, nearly equal, pear-shaped collar pores. _Dimensions._--Shell 0.06 long, 0.08 broad. _Habitat._--Mediterranean; Messina, surface. Subgenus 4. _Dictyospyromma_, Haeckel. _Definition._--Basal plate with six or more collar pores. {1077}15. _Dictyospyris hexastoma_, n. sp. Shell nut-shaped, tuberculate, with deep sagittal stricture. Pores small, irregular, roundish. Three pairs of larger pores on each side of the ring. Basal plate with six large pores; the middle pair (cardinal) twice as large as the anterior (jugular) and the posterior (cervical). _Dimensions._--Shell 0.08 long, 0.12 broad. _Habitat._--Fossil in Barbados. 16. _Dictyospyris enneastoma_, n. sp. Shell ellipsoidal, smooth, without external sagittal stricture, but with an internal free sagittal ring. Pores small and numerous, regular, circular. No larger annular pores. Basal plate with nine pores, three larger interradial alternating with three pairs of adradial. _Dimensions._--Shell 0.07 long, 0.11 broad. _Habitat._--South Pacific, Station 297, depth 1775 fathoms. 17. _Dictyospyris polystoma_, n. sp. Shell nut-shaped, mammillate, with distinct sagittal stricture. Pores small and numerous, irregular, on each side of the ring three to five times as large as on the lateral sides. Basal plate with twelve large pores (four central and four alternate pairs of peripheral). _Dimensions._--Shell 0.1 long, 0.14 broad. _Habitat._--Tropical Atlantic, Station 338, depth 1990 fathoms. Family LIII. #THOLOSPYRIDA#, n. fam. (Pl. 87, figs. 7-10; Pl. 89, figs. 1-4; Pl. 95, figs. 14-16).