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

12. Sphærozoum verticillatum, n. sp. (Pl. [4], fig. 7).

Spicula all geminate-triradiate, with a short simple middle rod and three much longer arborescent shanks on each end of it. Shanks straight, slender, pine-shaped, each in the distal half with three to four elegant verticils of thorny lateral branches.

Dimensions.—Diameter of the capsules 0.1 to 0.12, middle rod of the spicula 0.03 to 0.05, shanks 0.1 to 0.15.

Habitat.—Indian Ocean, Ceylon, Haeckel; Madagascar, Rabbe; surface.

13. Sphærozoum octoceras, n. sp.

Spicula all geminate-quadriradiate, with a short simple middle rod and four diverging shanks on each end of it. Shanks smooth, irregularly curved or bent, three to six times as long as the middle rod. It may be regarded as the social form of Thalassoxanthium octoceras (Pl. [2], fig. 6).

Dimensions.—Diameter of the capsules 0.12 to 0.16, middle rod of the spicula 0.02, shanks 0.01.

Habitat.—Australia, south coast, Faber; Station 163, surface.

14. Sphærozoum quadrigeminum, n. sp.

Spicula all geminate-quadriradiate, with a long thick middle rod and four shorter diverging shanks on each end of it. Shanks straight, thorny.