Habitat.—Central Pacific, Stations 271 to 274, surface.
22. Sethoconus anthocyrtis, n. sp. (Pl. [62], fig. 21).
Anthocyrtis sethoconus, Haeckel, 1879, Atlas, loc. cit.
Cephalis small, subspherical, with very small pores and numerous radial, bristle-shaped spines of the same length. Thorax wide, conical, about as long as broad, with parabolic outlines, its network very delicate, with subregular, hexagonal meshes. Surface with scarce, bristle-shaped spines (not represented in the figure). Mouth with a corona of numerous small, vertical spines.
Dimensions.—Cephalis 0.025 diameter, thorax 0.26 long, 0.24 broad.
Habitat.—North Pacific, Station 248, surface.
23. Sethoconus virgultus, n. sp.
Cladarachnium virgultum, Haeckel, 1881, Prodromus, p. 430.
Cephalis and thorax nearly of the same form and stricture as in Sethoconus facetus, but larger and wider, with the same delicate, hexagonal network (Pl. [55], fig. 1); it differs from the latter by the wider, more convex and campanulate form, but mainly by the armature of the surface, which is densely covered with thin, arborescent, bristle-shaped spines, irregularly branched, and four to eight times as large as the cephalis.
Dimensions.—Cephalis 0.02 diameter, thorax 0.32 long, 0.4 broad.