Shell thick walled, smooth. Pores regular, circular, double-edged, five times as broad as the bars, sixteen to eighteen on the quadrant.
Dimensions.—Diameter of the shell 0.25, pores 0.01, bars 0.002.
Habitat.—North Atlantic, Station 64, depth 2700 fathoms.
17. Cenosphæra elysia, n. sp. (Pl. [12], fig. 8).
Shell thick walled, rough. Pores regular, circular, double-edged, twice as broad as the bars, twelve to fourteen on the quadrant.
Dimensions.—Diameter of the shell 0.2, pores 0.01, bars 0.005.
Habitat.—Central Pacific, Station 266, depth 2750 fathoms.
18. Cenosphæra nirwana, n. sp.
Shell thick walled, smooth. Pores regular, circular, twice as broad as the bars, twenty-four to twenty-five on the quadrant.
Dimensions.—Diameter of the shell 0.25, pores 0.004, bars 0.002.