Habitat.—South Atlantic, Station 332, depth 2200 fathoms.
3. Castanissa richardsi, n. sp.
Pores subregular, circular, about as broad as the bars. Bristles twice as long as one pore. Radial main-spines (about twenty) slender, cylindrical, irregularly curved, with dimpled surface (like those in Pl. [113], fig. 5a). Mouth with a corona of six stout, parallel, triangular teeth.
Dimensions.—Diameter of the shell 0.3 to 0.35, of the pores 0.015.
Habitat.—North Atlantic, Station 354, surface.
4. Castanissa crosbiei, n. sp.
Pores irregular, roundish, two to three times as broad as the bars. Bristles one-third as long as the radius. Radial main-spines very numerous, straight, cylindrical, smooth, about as long as the diameter of the shell. Mouth with ten or twelve irregular, conical, parallel teeth.
Dimensions.—Diameter of the shell 0.28, of the pores 0.01 to 0.015.
Habitat.—North Pacific, Stations 231 to 235, surface.
5. Castanissa macleani, n. sp.