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.—Length of the shell 0.25 to 0.3, breadth 0.15 to 0.2; length and breadth of the peristome 0.1.

Habitat.—North Pacific, Station 245, surface.

Subgenus 2. Challengerebium, Haeckel.

Definition.—Margin of the shell with two widely distant aboral spines, opposite in the sagittal plane, a dorsal and a ventral.

7. Challengeron balfouri, John Murray.

Challengeria balfouri, John Murray, 1879, in litteris, Narr. Chall. Exp., vol. i. p. 226, pl. A, fig. 10.

Shell subcircular, lenticular, strongly compressed, with two short divergent spines on the apical margin (a dorsal and a ventral). Peristome slender, semitubular, as long as the radius, vertical, in the distal half forked, with two parallel teeth.

Dimensions.—Diameter of the shell 0.08 to 0.16, length of the peristome 0.04 to 0.08.

Habitat.—North Atlantic, Stations 353 to 354, Hebrides, surface.

8. Challengeron golfense, n. sp.