_Dimensions._--Shell 0.09 long, 0.11 broad; horn and feet 0.4 to 0.6 long. _Habitat._--Central Pacific, Stations 270 to 274, depth 2350 to 2925 fathoms. 3. _Dorcadospyris lunulata_, n. sp. Shell subspherical spinulate, nearly of the same shape as in the preceding species, but with a short conical horn (scarcely as long as the shell); the feet are much mere slender, crescentic, and bear twenty to thirty smaller smooth conical teeth (shorter than the shell). The distal ends of the feet are crossed. _Dimensions._--Shell 0.08 long, 0.09 broad; horn 0.06 long, feet 0.03 to 0.06 long. _Habitat._--Central Pacific, Station 266, depth 2750 fathoms. 4. _Dorcadospyris decussata_, n. sp. (Pl. 85, fig. 7). Shell subspherical, smooth, very similar to that of the two preceding species. Horn small conical, about as long as the shell. Feet more than semicircular, more strongly curved than in any other species, each with four to eight small conical teeth, shorter than the shell; distal ends crossed. (In this species also, besides the normal symmetrical form, there often occurs an asymmetrical form of the two feet; one of these frequent anomalies is shown in fig. 7.) _Dimensions._--Shell 0.06 long, 0.08 broad; horn 0.05, feet 0.2 to 0.5 long. _Habitat._--Central Pacific, Stations 265 to 268, depth 2700 to 2900 fathoms. 5. _Dorcadospyris dinoceras_, n. sp. (Pl. 85, fig. 4). Shell subspherical, tuberculate, with subregular circular pores. Basal plate with four larger central and eight to twelve smaller peripheral pores. Horn about as long as the shell, in the basal half prismatic, smooth, in the distal half ovate or strobiliform, spiny. Feet very large and strongly curved, together nearly heart-shaped, four to six times as long as the shell. Each foot bears on its outer convex side a series of fifteen to twenty or more strong conical teeth, which are again spinulate, perpendicular to the foot, and longer than the shell. _Dimensions._--Shell 0.08 long, 0.09 broad; horn 0.07 long, feet 0.3 to 0.5 long. _Habitat._--Central Pacific, Station 268, depth 2900 fathoms. {1042}Genus 449. _Gamospyris_,[67] Haeckel, 1881, Prodromus, p. 441. _Definition._--#Zygospyrida# with two simple lateral feet, forming a ring by union. The genus _Gamospyris_ and the similar _Stephanospyris_ differ from all other #Spyroidea# in the possession of a large basal ring, placed in the frontal plane of the shell. This ring has been produced by concrescence of the distal ends of the two large curved lateral feet of _Dipospyris_. 1. _Gamospyris circulus_, n. sp. (Pl. 83, fig. 19). Shell subspherical, tuberculate, with subregular circular pores. Basal plate with four larger collar pores. Apical horn pyramidal, about as long as the shell. The connected feet form together a circular or nearly circular smooth ring, the diameter of which is three to four times as great as that of the shell. _Dimensions._--Shell 0.08 long, 0.09 broad; diameter of the arm-ring 0.25 to 0.33.