Dimensions.—Shell 0.09 long, 0.06 broad; mouth 0.035 broad.
Habitat.—Fossil in tertiary rocks of Sicily (Grotte).
5. Cyrtocalpis sethopora, n. sp. (Pl. [52], fig. 4).
Shell smooth, urceolate, very thin-walled, with large irregular roundish meshes, each of which is closed by a thin porous sieve-plate. Mouth two-thirds as broad as the shell, with a broad, emarginate, longitudinally striped peristome. (Perhaps the shell of a Tintinnoid Infusorium?)
Dimensions.—Shell 0.08 long, 0.05 broad; mouth 0.03 broad.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
6. Cyrtocalpis compacta, n. sp. (Pl. [52], figs. 7, 8).
Shell smooth, ovate, very thick-walled, with small, subregular, circular pores of equal size, perpendicularly perforating the wall, about half as broad as the bars. Mouth small, only one-third as broad as the compact shell. (Perhaps a reduced Lithocampe or Lithomitra?)
Dimensions.—Shell 0.08 long, 0.04 broad; mouth 0.015 broad.
Habitat.—Central Pacific, Station 268, depth 2900 fathoms; also fossil in Barbados.