Dimensions.—Cephalis 0.02 long, 0.03 broad; thorax 0.1 long, 0.4 broad.
Habitat.—South Atlantic, Station 325, surface.
19. Sethophormis leptoscenium, n. sp.
Cephalis very small, spherical, with few small, circular pores. Thorax flatly conical or tent-shaped, with concave lateral outlines, small hexagonal meshes, and numerous (thirty to forty or more) strong, little curved, simple radial ribs. Peristome nearly circular, with a corona of small, irregular, conical spines.
Dimensions.—Cephalis 0.015 diameter; thorax 0.07 long, 0.26 broad.
Habitat.—Indian Ocean, Madagascar (Rabbe), surface.
20. Sethophormis leptopilium, n. sp.
Cephalis very small, subspherical, hyaline, without pores. Thorax flatly conical or hat-shaped, with concave lateral outlines, and a very delicate network of small square meshes (similar to Litharachnium araneosum, Pl. [55], fig. 8). This is supported by thirty-two curved radial ribs, four of which are primary, four secondary, and the other twenty-four interpolated. Peristome horizontally expanded and little recurved, like the reflexed brim of a hat.
Dimensions.—Cephalis 0.12 diameter; thorax 0.08 long, 0.24 broad.
Habitat.—South Pacific, Station 291, depth 2250 fathoms.