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

7. Mesocena pentagona, n. sp.

Rings regularly pentagonal, with smooth straight bars, and with five short and straight radial spines on the five corners.

Dimensions.—Diameter of the rings 0.02, length of the spines 0.005.

Habitat.—Fossil in Barbados.

8. Mesocena hexagona, Haeckel.

? Mesocena senaria, Ehrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, pp. 163, 273.

? Mesocena septenaria, Ehrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, pp. 163, 273.

Rings regular, hexagonal, with six radial spines on the six corners (sometimes between the usual six-radiate rings of one and the same individual are intermingled single rings with five or seven spines).

Dimensions.—Diameter of the rings 0.025 to 0.03, length of the spines 0.007 to 0.01.

Habitat.—Mediterranean, Krim (Ehrenberg), Corfu (Haeckel).