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.—Height of the rings 0.07, breadth 0.1.

Habitat.—Cosmopolitan; Mediterranean, Atlantic, Pacific, surface.

2. Zygostephanus serratus, n. sp.

Both rings elliptical, of nearly equal height, with a serrate prominent edge on the outer convexity (in the transverse section three-edged). No sagittal constriction.

Dimensions.—Height of the rings 0.08, breadth 0.12.

Habitat.—Central Pacific, Station 266, depth 2750 fathoms.

3. Zygostephanus mülleri, Haeckel.

Zygostephanus mülleri, Haeckel, 1862, Monogr. d. Radiol., p. 268, Taf. xii. fig. 2.

Both rings elliptical, of nearly equal height, armed with numerous (about fifty) slender curved spines, as long as the radius of the rings; commonly each ring with twelve pairs of divergent spines. No sagittal constriction.

Dimensions.—Height of the rings 0.06, breadth 0.1.