Habitat.—Central Pacific, Station 266, surface.
2. Tripocyrtis tripodiscus, n. sp.
Cephalis subspherical, with small, polygonal pores and a large, arborescent, vertical horn of thrice the length, bearing numerous ramified branches. Thorax with three straight, widely divergent ribs, of the same length as the horn, connected by a delicate, arachnoidal framework with irregular, polygonal meshes.
Dimensions.—Cephalis 0.04 long, 05 broad; thorax 0.12 long, 0.18 broad.
Habitat.—Central Pacific, Station 269, surface.
3. Tripocyrtis plectaniscus, n. sp. (Pl. [60], fig. 9).
Cephalis subspherical, with small roundish pores, and a stout, three-sided pyramidal, denticulate horn of the same length. Thorax with three little divergent and curved ribs, twice as long as the horn, in the upper half with smaller, in the lower half with larger, polygonal, irregular meshes.
Dimensions.—Cephalis 0.05 long, 0.06 broad; thorax 0.1 long, 0.12 broad.
Habitat.—Central Pacific, Station 264, surface.