Petalospyris spinosa, Stöhr, 1880, Palæontogr., vol. xxvi. p. 98, Taf. iii. fig. 14.
Shell subspherical, smooth, with slight sagittal stricture and irregular polygonal pores; on each side of the stricture two pairs of larger pores. Basal plate with two large pores only. Apical horn short, pyramidal, three primary feet half as long as the shell and twice as long as the three secondary feet. All six feet pyramidal, slightly divergent.
Dimensions.—Shell 0.05 long, 0.07 broad; horn 0.02, feet 0.02 to 0.04 long.
Habitat.—Fossil in Tertiary rocks of Sicily (Grotte, Caltanisetta).
5. Hexaspyris ophirensis, Haeckel.
Petalospyris ophirensis, Ehrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 297, Taf. ix. fig. 24.
Shell nut-shaped, with deep sagittal stricture and numerous irregular roundish pores; two pairs of larger pores on each side of the stricture. Apical horn short, curved. Six feet equal, divergent, straight, slender, about as long as the shell.
Dimensions.—Shell 0.05 long, 0.1 broad; horn 0.01, feet 0.05 to 0.08 long.
Habitat.—Indian Ocean (Zanzibar), depth 2200 fathoms, Pullen.