Shell nut-shaped, tuberculate, with deep sagittal stricture. Pores irregular roundish. Basal plate with six pores (?). Two pectoral feet very large, twice as long as the shell, cylindrical, curved. Two tergal feet half as long and thick as the pectoral. Caudal foot and apical horn straight, conical, half as long as the shell.
Dimensions.—Shell 0.07 long, 0.09 broad; horn and odd caudal foot 0.04 long; pectoral feet 0.16, tergal 0.08 long.
Habitat.—South Pacific, Station 297, depth 1775 fathoms.
2. Clathrospyris pyramidalis, n. sp. (Pl. [95], fig. 9).
Shell four-sided pyramidal, truncate, thorny, with a slight sagittal stricture. Pores very large, polygonal roundish. Two pairs of large pores on each side of the ring (at the frontal and the occipital plate). Lateral pores more numerous. Basal plate with four large pores. The four edges of the pyramid are prolonged into four short pyramidal divergent lateral feet (one-third as long as the shell). Caudal foot short. Horn at the apex of the truncate pyramid with two lateral teeth.
Dimensions.—Shell 0.06 long, 0.08 broad; horn and feet 0.02 long.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
3. Clathrospyris fusiformis, n. sp.
Shell nearly cubical, smooth, with slight sagittal stricture. Pores roundish; three pairs of larger pores on each side of the ring. Basal plate with six large pores. Five feet of equal length, slender, spindle-shaped, about as long as the shell, divergent. Apical horn conical, and half as long as the feet.
Dimensions.—Shell 0.08 long, 0.09 broad; horn 0.05 long, feet 0.1 long.