6. Medusetta spiralis, n. sp.
Shell hemispherical, thorny, with wide open mouth. Apical horn straight, vertical, thorny, twice as long as the shell; feet cylindrical, three times as long as the shell, spirally convoluted around the vertical axis of the shell, with a series of recurved teeth on the abaxial margin.
Dimensions.—Length of the shell 0.05, breadth 0.08.
Habitat.—Central Pacific, Stations 271 to 272, surface.
7. Medusetta craspedota, n. sp. (Pl. [120], fig. 4).
Shell campanulate or nearly spherical, spiny, twice as broad as the constricted mouth, which is surrounded by a funnel-shaped truncate velum. Apical horn conical, straight, spiny, half as long as the shell. Feet strongly curved, longer than the shell, with a series of short conical spines on the abaxial side.
Dimensions.—Length of the shell 0.06, breadth 0.06.
Habitat.—North Pacific, Station 239, surface.
Genus 701. Euphysetta,[[318]] n. gen.
Definition.—Medusettida with four articulate feet on the peristome, one odd very large, and three small or rudimentary feet.