Dimensions.—Shell 0.2 to 0.3 long, 0.12 to 0.16 broad.
Habitat.—Fossil in Barbados.
2. Cinclopyramis infundibulum, n. sp. (Pl. [54], fig. 7).
Shell slender, pyramidal, with nine strong radial ribs, which are connected by eighteen to twenty-four complete horizontal rings. Meshes subregular square, filled up by a very delicate and regular secondary network with square porules (ten to twelve horizontal threads in each larger mesh). Apex of the pyramid with three very small cortinar pores.
Dimensions.—Shell 0.3 to 0.4 long, 0.2 to 0.25 broad.
Habitat.—Tropical Atlantic, Station 338, depth 1990 fathoms.
3. Cinclopyramis lithosestrum, n. sp.
Shell slender, pyramidal, with twelve strong radial ribs (six primary longer and six secondary shorter) connected by twelve to fifteen interrupted irregular rings. Meshes irregular square or trapezoidal, filled up by a delicate secondary network with irregular polygonal porules.
Dimensions.—Shell 0.4 to 0.5 long, 0.2 to 0.3 broad.
Habitat.—Fossil in Barbados.