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 spines 0.24, of their fork-branches 0.12.

Habitat.—North Pacific, Station 254, surface.

3. Plagiacantha dodecantha, n. sp.

Spines straight, three-sided prismatic, in the middle with one verticil composed of three divergent straight branches of equal size, of about the same length as the simple basal part. The edges of the spines and their branches are thorny.

Dimensions.—Length of the spines 0.24, of the branches 0.1.

Habitat.—Central Pacific, Station 274, surface.

4. Plagiacantha abietina, Richard Hertwig.

Plagiacantha abietina, Richard Hertwig, 1879, Organismus d. Radiol., p. 72, Taf. vii. figs. 6-6b.

Spines straight, three-sided prismatic, with three verticils of three divergent straight lateral branches, decreasing in size towards the distal end; the branches of the first verticil about twice as long as those of the second, and four times as long as those of the third verticil. All nine branches of each spine simple, straight, three-sided pyramidal.

Dimensions.—Length of the spines 0.2 to 0.3, of the basal branches 0.06 to 0.08.