Dimensions.—Shell 0.09 long, 0.1 broad; horn and feet 0.05 to 0.06 long.
Habitat.—Central Pacific, Station 266, depth 2750 fathoms.
10. Tripospyris clavata, Haeckel.
Ceratospyris clavata, Bütschli, 1882, Zeitschr. f. wiss. Zool., vol. xxxvi. p. 539, Taf. xxxii. fig. 13, a-c.
Shell subspherical, compressed, rough, with slight sagittal stricture and ovate internal primary ring. Basal plate with four large collar pores (fig. 13a, loc. cit.). The other lattice-work with irregular small roundish pores. Apical horn and the three feet short and thick, scarcely half as long as the shell, with a roundish spinulate knob at the distal end.
Dimensions.—Length of the shell 0.07 long, 0.08 broad; horn and feet 0.02 to 0.03 long.
Habitat.—Fossil in Barbados.
11. Tripospyris tessaromma, n. sp.
Shell nearly cubical, spiny, with deep sagittal stricture and subcircular ring. Basal plate with four large collar pores. Facial and occipital plates each also with two pairs of large square annular pores; lateral pores irregular polygonal. Apical horn half as long as the feet, which are three times the length of the shell, cylindrical, slightly curved.
Dimensions.—Shell 0.1 long, 0.12 broad; horn 0.15 long, feet 0.3 long.