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

Habitat.—West Tropical Pacific, Station 225, depth 4475 fathoms; also fossil in Barbados and in Sicily.

Subgenus 2. Ethmosphæromma, Haeckel.

Definition.—Tubuli cylindrical, their outer opening about as large as the inner.

4. Ethmosphæra stenosiphonia, n. sp.

Tubuli cylindrical, short, quite contiguous, so that their diameter is six times as large as their distance apart, but about equal to their height. Nine to ten pores on the quadrant.

Dimensions.—Diameter of the shell 0.14, outer pores 0.012, their distance 0.002.

Habitat.—Central Pacific, Station 271, surface.

5. Ethmosphæra pachysiphonia, n. sp.

Tubuli cylindrical, twice as long as broad, very thick-walled, and nearly contiguous, so that their diameter is five times as large as their distance apart. The thickness of their wall is equal to their lumen. Twelve to fourteen pores on the quadrant.

Dimensions.—Diameter of the shell 0.16, outer pores 0.01, their distance 0.002.