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

2. Leptosphæra serrata, n. sp.

Inner shell with regular, hexagonal meshes, five to six times as broad as the bars; outer shell three times as broad, with simple triangular meshes. Radial spines with three serrated edges (of the same form as the main spines of Drymosphæra dendrophora, Pl. [20], fig. 1).

Dimensions.—Diameter of the outer shell 0.45, of the inner 0.15.

Habitat.—Central Pacific, Station 271, surface.

3. Leptosphæra polygonalis, n. sp.

Inner shell with irregular, polygonal meshes and very thin thread-like bars; outer shell twice as broad, with simple triangular meshes. Radial spines with three smooth edges. (Resembles Drymosphæra polygonalis, Pl. [19], fig. 1, but has no by-spines.)

Dimensions.—Diameter of the outer shell 0.35, inner 0.175.

Habitat.—North Pacific, Station 256, surface.

Subgenus 2. Leptosphæromma, Haeckel.

Definition.—Radial spines with three rows of lateral branches (one row on each edge).