_Dimensions._--Shell 0.07 long, 0.09 broad; spines 0.02 to 0.08 long. _Habitat._--South Atlantic, Station 332, depth 2200 fathoms. 9. _Ceratospyris echinus_, Ehrenberg. _Ceratospyris echinus_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx, fig. 12. Shell subspherical, with slight sagittal stricture, studded with numerous conical curved spines; six basal and one apical spine are larger than the others, about as long as the shell. Pores numerous, small, circular. Basal plate with numerous pores. Bars of the network roundish. _Dimensions._--Shell 0.05 long, 0.06 broad; spines 0.02 to 0.05 long. _Habitat._--Fossil in Barbados. {1069}Subgenus 2. _Cladospyris_, Ehrenberg, 1847, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 54. _Definition._--Spines forked or branched. Meshes roundish or polygonal. 10. _Ceratospyris ramosa_, Ehrenberg. _Ceratospyris ramosa_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. fig. 7. _Cladospyris ramosa_, Ehrenberg, 1847, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 54. Shell nut-shaped, with slight sagittal stricture, studded with numerous conical, irregularly branched spines. The largest about as long as the shell. Pores irregular, roundish; on each side of the ring two pairs of larger pores. Basal plate with four pores. Bars of the network roundish. _Dimensions._--Shell 0.06 long, 0.08 broad; spines 0.02 to 0.08 long. _Habitat._--Fossil in Barbados. 11. _Ceratospyris carnerii_, n. sp. (Pl. 86, fig. 11). Shell nut-shaped, with sharp sagittal stricture, studded with numerous pyramidal spines; two basal spines are larger, as long as the shell, and irregularly branched. Pores polygonal; on each side of the ring three pairs of larger pores. Basal plate with four large pores. Dedicated to my dear friend, the excellent monistic philosopher, B. von Carneri. _Dimensions._--Shell 0.09 long, 0.12 broad; spines 0.02 to 0.08 long. _Habitat._--Western Tropical Pacific, Station 225, depth 4475 fathoms. 12. _Ceratospyris calorrhiza_, n. sp. (Pl. 87, fig. 19). Shell nut-shaped, with deep sagittal stricture, studded with numerous conical strong spines, about one-fourth as long as the shell. Basal spines irregularly branched, with root-like ends. Pores irregular, roundish, some larger pores on each side of the ring. Basal plate with four larger pores. Bars of the network roundish. _Dimensions._--Shell 0.1 long, 0.14 broad; spines 0.02 to 0.04 long. _Habitat._--Central Pacific, Station 271, surface. Genus 466. _Gorgospyris_,[84] Haeckel, 1881, Prodromus, p. 443. _Definition._--#Zygospyrida# with numerous (seven to twelve or more) basal feet, without coryphal horns.