Subgenus 3. Stauracontidium, Haeckel.
Definition.—Pores irregular, of different size or form; surface smooth.
6. Stauracontium antarcticum, n. sp.
Cortical shell thin walled, smooth. Pores irregular, roundish, two to four times as broad as the bars. Radial proportion of the three spheres = 1 : 2 : 8. Radial spines conical, as long as the radius.
Dimensions.—Diameter of the outer shell 0.2, middle 0.05, inner 0.025; cortical pores 0.006 to 0.012, bars 0.003; length of the spines 0.1.
Habitat.—Antarctic Ocean, Station 157, depth 1950 fathoms.
Subgenus 4. Stauracontonium, Haeckel.
Definition.—Pores irregular, of different size or form; surface covered with thorns or by-spines.
7. Stauracontium setosum, n. sp.
Cortical shell thin walled, covered with thin bristle-shaped by-spines, half as long as the radius. Pores irregular, polygonal, three to five times as broad as the bars. Proportion of the three spheres = 1 : 2 : 6. Radial main spines pyramidal, nearly as long as the shell diameter.