Central capsule spherical. Podoconus with simple circular porochora, half as long as the capsule. Nucleus spherical. Numerous oil-globules in the endoplasm. Calymma spherical, without pigment, with numerous xanthellæ and large alveoles.
Dimensions.—Diameter of the central capsule 0.12, nucleus 0.04, calymma 0.6.
Habitat.—South Pacific, Station 300 (off Juan Fernandez), surface.
2. Nassella nassiterna, n. sp.
Central capsule ovate. Podoconus two-thirds as long as the capsule, trifid, with three equal circular lobes (as in Cystidium inerme). Nucleus ovate. Three equal large oil-globules in the endoplasm, corresponding to the three lobes of the porochora. Calymma ovate, in the upper half much more voluminous than in the lower, including numerous large alveoli and xanthellæ, and around the mouth masses of black pigment.
Dimensions.—Diameter of the central capsule 0.1, nucleus 0.03, calymma 0.8.
Habitat.—Indian Ocean, Madagascar (Rabbe), surface.
Suborder II. PLECTOIDEA, Haeckel.
Plectoidea vel Plectida, Haeckel, 1881, Prodromus, p. 423.