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

Shell nearly spherical, composed of fifteen to eighteen irregularly aggregated roundish chambers of nearly equal size; in the centre a lentelliptical Larnacilla-shell. Surface covered with numerous thin, bristle-like radial spines, somewhat longer than the shell.

Dimensions.—Diameter of the whole shell 0.21, of the central Larnacilla-shell 0.05.

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

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Legion II. ACANTHARIA,

vel Actipylea, vel Acanthometrea (Pls. 129-140).

Acantharia, Haeckel, 1881.

Actipylea, Haeckel, 1882.

Acanthometrea, Hertwig, 1879.

Panacantha, Haeckel, 1878.