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

Habitat.—Central Pacific, Station 271, surface.

3. Cystidium inerme, R. Hertwig.

Cystidium inerme, R. Hertwig, 1879, Organismus d. Radiol., p. 87, Taf. vii. figs. 1-1b.

Central capsule subspherical, a little longer than broad. Podoconus about two-thirds as long as the capsule, with trifid porochora, which is composed of three equal circular lobes. Nucleus spherical. Numerous oil-globules in the endoplasm. The calymma includes numerous xanthellæ and brown pigment around the mouth.

Dimensions.—Length of the central capsule 0.06, breadth 0.05; nucleus 0.03.

Habitat.—Mediterranean, Messina (R. Hertwig), surface.

Genus 383. Nassella,[^[2]] nov. gen.

Definition.—Nassellida with foamy calymma, containing numerous large extracapsular alveoles.

The genus Nassella differs from the preceding Cystidium, its probable ancestral form, in the development of numerous large alveoles in the extracapsular calymma, and therefore exhibits the same relation to it that Thalassicolla bears to Actissa among the Spumellaria. The foamy calymma is very voluminous, and includes numerous symbiotic xanthellæ.

1. Nassella thalassicolla, n. sp.