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

Habitat.—Tropical Atlantic, Stations 347, 348, depth 2250 to 2450 fathoms.

8. Challengeria harstoni, John Murray.

Challengeria harstoni, John Murray, 1879, in litteris, Narr. Chall. Exp., vol. i. p. 226, pl. A, fig. 14a.

Shell subcircular or somewhat triangular, with convex margins. Peristome with two parallel, slender, lanceolate teeth, which are obliquely ascending, and about half as long as the shell-radius.

Dimensions.—Diameter of the shell 0.15 to 0.18, length of the teeth 0.04 to 0.05.

Habitat.—North Pacific, Station 231, depth 2250 fathoms.

9. Challengeria campbelli, John Murray.

Challengeria campbelli, John Murray, 1879, in litteris, Narr. Chall. Exp., vol. i. p. 226, pl. A, fig. 9.

Shell cordate, nearly triangular, compressed, with blunt apex. Peristome in the excavated middle of the broad base, with two short, parallel, triangular teeth. This species is very similar to Porcupinia cordiformis (Pl. [99], fig. 16), but differs from it in the absence of an internal pharynx and of external apical spines.

Dimensions.—Diameter of the shell 0.2 to 0.24; length of the teeth 0.03 to 0.05.