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

Dimensions.—Diameter of the gate 0.07; length of the spines 0.04 to 0.06.

Habitat.—Central Pacific, Station 268, depth 2900 fathoms.

6. Zygocircus hexagonus, n. sp.

Gate irregularly hexagonal. Ring obliquely hexagonal, thick, without edges, with six short and stout conical spines on the six corners. The two spines of the curved ventral rod are longer than the two spines of the straight dorsal rod. The apical spine is smaller and the basal spine larger than the four others.

Dimensions.—Diameter of the gate 0.07 to 0.09; length of the spines 0.01 to 0.03.

Habitat.—North Pacific, Station 241, depth 2300 fathoms.

7. Zygocircus triquetrus, n. sp. (Pl. [81], fig. 3).

Gate obliquely ovate. Ring obliquely hexagonal, with three sharp edges and three short conical spines on each of the six corners. Therefore each hexagonal edge bears six short radial spines of equal size.

Dimensions.—Diameter of the gate 0.04 to 0.08; length of the spines 0.01 to 0.02.

Habitat.—Cosmopolitan; Mediterranean, Atlantic, Pacific, surface.