Habitat.—South Atlantic, Station 330, surface.
Subgenus 4. Thecosphæromma, Haeckel.
Definition.—Pores of the cortical shell irregular, roundish, of unequal size or dissimilar form.
12. Thecosphæra dodecactis, n. sp.
Cortical shell thin walled, smooth, with large irregular roundish pores, two to eight times as broad as the bars. Both medullary shells with regular circular pores, twice as broad as the bars. Radial proportion of the three spheres = 1 : 2 : 5; they are connected by twelve regularly disposed stout radial beams.
Dimensions.—Diameter of the outer shell 0.2, middle 0.08, inner 0.04; cortical pores 0.004 to 0.016, bars 0.002.
Habitat.—Central Pacific, Station 263, depth 2650 fathoms.
13. Thecosphæra icosactis, n. sp.
Cortical shell thin walled, with small irregular roundish pores, two to four 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 twenty thin radial beams.
Dimensions.—Diameter of the outer shell 0.32, middle 0.12, inner 0.04; cortical pores 0.005 to 0.012, bars 0.003.