Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) / 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 shell 0.05, of the central chamber 0.015; length of the arms 0.02, breadth 0.016.

Habitat.—North Pacific, Station 244, depth 2900 fathoms.

3. Triolena trispinosa, n. sp.

Arm-chambers ovate, in the basal half nearly as broad as the hexagonal central chamber, at the pointed distal end with a strong conical radial spine of double the length. Surface rough.

Dimensions.—Diameter of the shell 0.055, of the central chamber 0.02.

Habitat.—Western Tropical Pacific, Station 225, depth 4475 fathoms.

4. Triolena hexabelone, n. sp.

Arm-chambers nearly triangular, at the base half as broad as the hexagonal central chamber, at the truncate distal end one and a half times as broad, and armed with two radial conical spines (in the equatorial plane). Surface of the disk smooth.

Dimensions.—Diameter of the shell 0.06, of the central chamber 0.02.

Habitat.—South Pacific, Station 295, depth 1500 fathoms.