Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Second Part: Subclass Osculosa; Index / Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII

by Ernst Haeckel

Eucyrtidium gracile, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, Taf. xi. fig. 15.

Cephalis small, subspherical, with few scarce pores, and a stout, pyramidal horn, of the same length. Thorax slenderly conical, three to four times as long as broad, with straight outlines, and very small and numerous circular pores of equal size.

Dimensions.—Cephalis 0.015 diameter, thorax 0.12 long, 0.04 broad.

Habitat.—Fossil in Barbados.

19. Sethoconus bimarginatus, n. sp. (Pl. [54], fig. 12).

Cornutella bimarginata, Haeckel, 1879, Atlas, loc. cit.

Cephalis very small, subspherical, hyaline, without pores, with a rudimentary, conical horn of the same length. Thorax slenderly conical, three times as long as broad, with undulated, little convex outlines, and irregular, roundish, double-contoured pores, arranged in nine longitudinal series, markedly increasing in size towards the mouth.

Dimensions.—Cephalis 0.01 diameter, thorax 0.16 long, 0.05 broad.

Habitat.—South Pacific, Station 300, depth 1375 fathoms.

20. Sethoconus clathratus, Haeckel.