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

Definition.—Radial spines simple, smooth or spiny, but neither branched nor arborescent.

1. Orosphæra hastigera, n. sp.

Radial spines cylindrical, straight, smooth, simple, about as long as the diameter of the spherical shell, and as broad as its smooth bars. Meshes of the network irregularly polygonal, the majority quadrangular, of different sizes.

Dimensions.—Diameter of the sphere 1.0 to 1.2, length of the radial spines 1.1 to 1.5, middle breadth 0.004.

Habitat.—Central Pacific, Station 272, depth 2600 fathoms.

2. Orosphæra spinigera, n. sp.

Radial spines cylindrical, irregularly curved, thorny, simple, two to three times as long as the diameter of the spherical shell, and as broad as its spiny bars. Meshes of the network irregularly polygonal, the majority pentagonal.

Dimensions.—Diameter of the sphere 1.5 to 1.8, length of the spines 3.0 to 5.0, breadth 0.006.

Habitat.—North Atlantic, Station 353, depth 2965 fathoms.

3. Orosphæra fusigera, n. sp.