Shell rough, with two distinct transverse constrictions and irregular polygonal pores. Galea ovate, with a slender conical oblique horn, about as large as the cephalis, which exhibits a deep longitudinal furrow in the sagittal dorsal line. Thorax half as long, prolonged into three short latticed feet; the terminal spines of the two lateral feet are vertical and parallel, that of the caudal foot larger, directed obliquely backwards.
Dimensions.—Length of the shell (including horn and feet) 0.35, breadth 0.1 to 0.12.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.
3. Androspyris pithecus, n. sp. (Pl. [95], fig. 20).
Shell smooth, with two slight transverse constrictions. Galea conical, with a short conical horn, longer than the nut-shaped cephalis. Thorax with three nearly vertical and parallel feet of equal length. Pores in the galea and thorax very small and numerous, circular, in the cephalis much larger, irregular, roundish.
Dimensions.—Length of the shell (including horns and feet) 0.25, breadth 0.06 to 0.08.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
4. Androspyris aptenodytes, n. sp.
Shell smooth, with two slight transverse constrictions and irregular, roundish pores. Galea hemispherical, with a short conical horn, about as large as the roundish cephalis and half as large as the ovate thorax. The three feet arise immediately beyond the collar stricture, are equal, divergent, curved, about as long as the cephalis, and are not terminal (as in the three preceding species), but lateral appendages of the thorax.
Dimensions.—Length of the shell 0.2, breadth 0.05 to 0.07.