Dimensions.—Shell 0.2 to 0.3 long, 0.12 to 0.2 broad.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
3. Bathropyramis trapezoides, n. sp. (Pl. [54], fig. 3).
Shell smooth, broadly pyramidal, with four cortinar pores at the apex and eight (or sometimes nine) stout radial beams, connected by twelve to sixteen complete octagonal horizontal rings. Meshes trapezoidal, of nearly equal length, but gradually increasing in breadth.
Dimensions.—Shell 0.3 long, 0.3 broad.
Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
4. Bathropyramis interrupta, n. sp. (Pl. [55], fig. 7).
Shell smooth, flatly pyramidal, nearly discoidal, with four cortinar pores at the apex and nine to ten stout radial beams, connected by eight to sixteen interrupted rings; the rings are complete only in the apical part, in the distal part more or less irregularly interrupted.
Dimensions.—Shell 0.12 long, 0.36 broad.
Habitat.—North Atlantic, Station 354, surface.