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

6. Archicircus quadratus, n. sp.

Gate square. Ring square, with three edges and four short simple pyramidal spines on the four corners, opposite in pairs in two perpendicular diameters. Transverse section triangular.

Dimensions.—Diameter of the gate 0.08; thickness of the ring 0.008.

Habitat.—Central Pacific, Station 265, depth 2900 fathoms.

7. Archicircus rhombus, n. sp. (Pl. [81], fig. 7).

Gate rhombic. Ring rhombic, with four prominent edges and four pairs of short, divergent, pyramidal spines on the four corners, arising from the lateral edges of the four rods, about as long as the radius of the gate.

Dimensions.—Diameter of the gate 0.04 to 0.08; thickness of the ring 0.007 to 0.01.

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

8. Archicircus duodenus, n. sp.

Gate square or rhombic. Ring rhombic, with three prominent edges and twelve stout and straight pyramidal spines, about as long as the radius of the gate. In each of the four corners are three divergent spines, arising from the three edges of each two meeting rods.