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. Subgenus 2. _Hexacorethra_, Haeckel. _Definition._--Feet forked or branched. 6. _Hexaspyris hexacorethra_, n. sp. (Pl. 95, fig. 8). _Hexacorethra magica_, Haeckel, 1882, Manuscript. Shell campanulate, smooth, with sharp sagittal stricture and irregular roundish pores. Basal plate with six larger collar pores. Apical horn very long and thin, three-sided prismatic, straight, ten to twenty times as long as the shell, branched at the distal end. Six feet thinner, bristle-shaped, six to eight times as long as the shell, divergent, irregularly curved, in the distal part branched, besom-shaped; the sternal foot at its base with a large conical horizontal spur. _Dimensions._--Shell 0.034 diameter; horn 0.4 to 0.8 long, feet 0.2 to 0.3 long. _Habitat._--Central Pacific, Station 265, surface. 7. _Hexaspyris articulata_, Haeckel. _Ceratospyris articulata_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. fig. 4. Shell nut-shaped, tuberculate, with deep sagittal stricture and small irregular roundish pores. Basal plate with six pores (?). Apical horn conical, longer than the shell. Six feet very large, thick {1049}cylindrical, divergent, three to four times as long as the shell, with few irregular lateral branches (often much more developed than in Ehrenberg's figure). _Dimensions._--Shell 0.036 long, 0.05 broad; horn 0.05, feet 0.1 to 0.15 long. _Habitat._--Fossil in Barbados. Genus 454. _Liriospyris_,[72] Haeckel, 1881, Prodromus, p. 443. _Definition._--#Zygospyrida# with six basal feet and three coryphal horns. The genus _Liriospyris_ differs from the preceding _Hexaspyris_, its ancestral form, in the possession of three coryphal horns (one odd apical in the middle, and two paired frontal horns on each side of it); it therefore bears to the latter the same relation that _Triceraspyris_ does to _Tripospyris_. 1. _Liriospyris hexapoda_, n. sp. (Pl. 86, fig. 7). Shell subspherical, smooth, with slight sagittal stricture and irregular roundish pores; two to three pairs of large annular pores on each side of the stricture. Basal plate with four large collar pores. Three horns and six feet nearly of the same size and of similar form, conical, divergent, about one-third as long as the shell. _Dimensions._--Shell diameter 0.09 to 0.1; horns and feet 0.03 to 0.04 long. _Habitat._--Central Pacific, Stations 265 to 268, depth 2700 to 2900 fathoms. 2. _Liriospyris clathrata_, Haeckel. _Dictyospyris clathrus_, Ehrenberg, 1854, Mikrogeol., Taf. xxxvi. fig. 25.