Habitat.—Central Pacific, Station 268, depth 2900 fathoms.
5. Pteroscenium macropodium, n. sp.
Shell campanulate, spinulate, with irregular polygonal pores; very similar to the two preceding species, but differing in the size and shape of the three feet, which are for the most part solid, triangular, nearly parallel, vertical, very slender, three times as long as the shell, latticed only at the curved base, with few pairs of lateral branches. Columella with four to six triradiate verticils, as long as the stout triangular pyramidal horn.
Dimensions.—Shell 0.1 long, 0.08 broad.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
6. Pteroscenium tripocolpum, n. sp.
Shell campanulate, spinulate, similar to Euscenium tricolpium (Pl. [53], fig. 12) with three vaulted hemispherical bosoms between the three delicate arachnoidal vertical wings. Network loose, very irregular, with polygonal meshes of very different sizes. Columella with three or four triradiate verticils, as long as the slender pyramidal horn. Three feet twice as long, somewhat curved, widely divergent, with three or four pairs of lateral branches. The three edges of the feet and of the horn are elegantly denticulated.
Dimensions.—Shell 0.06 long, 0.09 broad.
Habitat.—Central Pacific, Station 266, depth 2750 fathoms.