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.—Cosmopolitan; Mediterranean, Atlantic, Pacific, surface.

8. Acanthometron wageneri, Haeckel.

Acanthometra wageneri, Haeckel, 1862, Monogr. d. Radiol., p. 378.

Spines cylindrical, in the thickened outer half about twice as broad as in the thin inner half. Central base a little thickened, with large fulcral pyramid, but without leaf-cross. Distal apex bifid, with two divergent, often denticulated teeth. Central capsule pellucid, with yellow pigment-bodies. (Differs from Acanthometron dolichoscion mainly in the bifid apex.)

Dimensions.—Length of the spines 0.2 to 0.5, breadth in the inner part 0.003, in the outer 0.006.

Habitat.—Adriatic Sea; Triest, Wagner; Corfu, Haeckel, surface.

Subgenus 2. Phyllostaurus, Haeckel, 1862, Monogr. d. Radiol., p. 381.

Definition.—Spines at the central base with a broad leaf-cross, composed of four prominent triangular lamellæ; the meeting edges of the neighbouring lamellæ are propped one upon another in such a manner that there are formed twenty-two hollow pyramidal spaces or compartments (compare p. [721]).

9. Acanthometron siculum, Haeckel.

Acanthometra sicula, Haeckel, 1862, Monogr. d. Radiol., p. 382, Taf. xvii. figs. 1, 2; Taf. xviii. fig. 8.