_Dimensions._--Shell 0.08 long, 0.09 broad; ring 0.06 long; horn and feet 0.03 long. _Habitat._--Mediterranean, Messina (R. Hertwig). 3. _Lophospyris comosa_, n. sp. Shell ovate, spiny, with deep transverse stricture. Cupola large, campanulate, nearly as long and two-thirds as broad as the nut-shaped cephalis. Pores irregular, roundish, of little different size, Basal plate with numerous (eight to twelve) similar pores. Apical horn large, nearly as long as the shell, surrounded by a bunch of smaller divergent spines. Two lateral feet divergent, larger than the shell, cylindrical; at the distal end irregularly branched, at the base surrounded by some smaller spines. _Dimensions._--Shell 0.15 long, 0.11 broad; ring 0.08 long; feet 0.2 long. _Habitat._--Western Tropical Pacific, Station 206, depth 2100 fathoms. Genus 471. _Sepalospyris_,[89] Haeckel, 1881, Prodromus, p. 443. _Definition._--#Tholospyrida# with numerous basal feet (eight to twelve or more). Galea with a horn. The genus _Sepalospyris_ has been derived from the similar _Petalospyris_ by development of a galea or cupola on the coryphal face of the cephalis, or from _Tholospyris_ by multiplication of the basal feet. The latter (in the two observed species from twelve to twenty-five) form a regular corona around the basal plate. 1. _Sepalospyris platyphylla_, n. sp. Pl. 95, fig. 15. Shell ovate, rough, with sharp transverse stricture. Cupola with delicate network, hemispherical, about two-thirds as long and broad as the nut-shaped thorax. Pores of the latter irregular, roundish; two or three pairs of large pores on each side of the sagittal stricture. Apical horn conical, half as long as the shell. Basal coronet with twelve to fifteen broad, lamellar, truncate, vertical feet, somewhat shorter than the cephalis. _Dimensions._--Shell 0.12 long, 0.13 broad; ring 0.06 long; horn 0.04; feet 0.05 long. _Habitat._--Central Pacific, Station 265, depth 2900 fathoms. 2. _Sepalospyris polyphylla_, n. sp. Shell campanulate, rough, with deep transverse stricture. Cupola hemispherical, about one-third as long and broad as the nut-shaped thorax. Pores irregular, roundish, a little different in {1082}size. Apical horn pyramidal, about as long an the shell. Basal coronet with twenty to twenty-five slender, lamellar, pointed, vertical feet, longer than the shell. _Dimensions._--Shell 0.11 long, 0.12 broad; ring 0.07 long; horn 0.1; feet 0.12 to 0.18 long. _Habitat._--Central Pacific, Station 268, depth 2900 fathoms. Genus 472. _Tiarospyris_,[90] Haeckel, 1881, Prodromus, p. 443. _Definition._--#Tholospyrida# with numerous basal feet (eight to twelve or more). Galea without a horn. The genus _Tiarospyris_ has probably been derived from the preceding _Sepalospyris_ by reduction and loss of the free apical horn; it therefore bears to it the same relation that the similar _Gorgospyris_ does to _Petalospyris_. 1. _Tiarospyris pervia_, n. sp. (Pl. 87, fig. 7).