Habitat.—South Pacific, Station 288, surface.
Subgenus 3. Thecosphærina, Haeckel.
Definition.—Pores of the cortical shell irregular polygonal, of unequal size or dissimilar form.
10. Thecosphæra capillacea, n. sp.
Cortical shell thin walled, smooth, with irregular polygonal pores, three to six times as broad as the bars. Both medullary shells with similar, but smaller, pores. Radial proportion of the three spheres = 1 : 3 : 8; they are connected by very numerous (sixty to eighty or more) thin radial beams. (Similar to Actinomma capillaceum, Pl. [29], fig. 6, but without external spines.)
Dimensions.—Diameter of the outer shell 0.2, middle 0.075, inner 0.025; cortical pores 0.006 to 0.012, bars 0.002.
Habitat.—North Pacific, Station 250, surface.
11. Thecosphæra diplococcus, n. sp.
Cortical shell thick walled, rough, with large irregular polygonal pores, two to three times as broad as the bars. Both medullary shells with small regular circular pores. Radial proportion of the three spheres = 1 : 2 : 6; they are connected by twenty (?) stout radial beams.
Dimensions.—Diameter of the outer shell 0.12, middle 0.04, inner 0.02; cortical pores 0.008 to 0.012, bars 0.004.