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

11. Tessaraspis quadrata, n. sp.

Tessaraspidium quadratum, Haeckel, 1882, Manuscript.

Parmal meshes square, four times as broad as the thin bars, on an average of the same size as the polygonal sutural meshes. Radial spines stout, tetrapterous, prismatic, in the outer part longer than in the inner. Sutures of the shell completely obliterated, therefore the whole shell forms one piece.

Dimensions.—Diameter of the shell 0.16, of the parmal pores 0.012, sutural pores 0.01 to 0.015.

Habitat.—South Atlantic, Station 332, depth 2200 fathoms.

12. Tessaraspis rotunda, n. sp.

Parmal meshes circular, of equal size, twice as broad as the thick bars, on an average smaller than the roundish sutural meshes. Radial spines cylindrical in the inner part, which is somewhat longer than the outer conical part. Sutures of the shell completely obliterated, therefore the whole shell forms one piece.

Dimensions.—Diameter of the shell 0.12, parmal pores 0.008, sutural pores 0.005 to 0.015.

Habitat.—North Atlantic, Station 354, surface.

13. Tessaraspis concreta, n. sp. (Pl. [136] fig. 5).