_Dictyospyris clathrata_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 68, Taf. xix. fig. 7. _Dictyospyris clathrata_, Bütschli, 1882, Zeitschr. f. Wiss. Zool., vol. xxxvi. pp. 506, 539; Taf. xxxii. figs. 10_a_, 10_b_. _Petalospyris clathrus_, Haeckel, 1862, Monogr. d. Radiol., p. 295. Shell campanulate or nearly spherical, smooth, with slight sagittal stricture. Three pairs of large annular pores on each side of the stricture; a few smaller irregular pores on the lateral sides. Basal plate with six large collar pores (Bütschli, _loc. cit._, fig. 10_a_). Three horns and six feet nearly of the same size and form; short, conical, slightly divergent or nearly parallel, shorter than half the ring. (The size of the nine appendages is in this common species rather variable; sometimes they are rudimentary, at other times much stronger than in the good figure of Bütschli.) _Dimensions._--Shell diameter 0.08 to 0.09, horns and feet 0.01 to 0.03. _Habitat._--Cosmopolitan; Mediterranean, Atlantic, Pacific; also fossil in Barbados and Sicily. {1050}3. _Liriospyris heteropoda_, n. sp. Shell nut-shaped, nodose, with deep sagittal stricture and small circular pores; two pairs of larger pores on each side of the stricture. Basal plate with four larger central and eight smaller peripheral pores. Apical horn conical, as long as the shell and twice as long as the two curved frontal horns. Three primary feet twice as long as the shell and as the three secondary feet, which are more highly inserted. All six feet slender curved, divergent. _Dimensions._--Shell 0.07 long, 0.11 broad; horn and secondary feet 0.08 long, primary feet 0.15 long. _Habitat._--Western Tropical Pacific, Station 225, depth 4475 fathoms. 4. _Liriospyris turrita_, Haeckel. _Ceratospyris turrita_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. fig. 1. Shell ovate, campanulate, smooth, with sharp sagittal stricture and irregular roundish pores; three to four pairs of larger pores on each side of the stricture. Basal plate with four large collar pores. Three horns short and stout, conical, fenestrated at the base. Six feet slender, conical, nearly vertical, of equal size, only one-third as long as the shell. _Dimensions._--Shell 0.08 long, 0.06 broad; horns 0.01 long, feet 0.03 long. _Habitat._--Fossil in Barbados. 5. _Liriospyris amphithecta_, n. sp. (Pl. 95, fig. 7). Shell nut-shaped, tuberculate, with distinct sagittal stricture and irregular roundish pores. Basal plate with six larger and twelve smaller pores. Three horns conical, the apical as long as the shell and twice as long as the curved frontal horns. Two pectoral feet cylindrical, very large, curved, divergent, about three times as long as the shell and as the four other feet, which are conical. _Dimensions._--Shell 0.08 long, 0.12 broad; apical horn 0.08, frontal horns 0.05 long; length of the two pectoral feet 0.2, of the four others 0.06.