1. Astrosphæra hexagonalis, n. sp. (Pl. [19], fig. 4).
Inner shell with regular, hexagonal meshes and very thin bars, having a bristle-shaped, short radial by-spine in each hexagon-corner; outer shell twice as broad, with simple triangular meshes and thicker bars, bearing one row of simple bristle-shaped, curved, radial by-spines. Radial main spines with three smooth edges.
Dimensions.—Diameter of the outer shell 0.32, inner 0.16.
Habitat.—South Pacific (West Patagonia), Station 302, surface.
2. Astrosphæra splendens, n. sp.
Inner shell with regular, hexagonal meshes, four times as broad as the bars, and covered with numerous curved, long, bristle-shaped by-spines; outer shell three times as broad, with simple triangular meshes and thin bars, bearing a row of very long, curved, bristle-shaped by-spines. Radial main spines with three dentated edges. All parts of the skeleton elegantly denticulated, as in Drymosphæra dendrophora (Pl. [20], fig. 1).
Dimensions.—Diameter of outer shell 0.7, inner 0.24.
Habitat.—Tropical Atlantic, Station 347, surface.
Subgenus 2. Astrosphæromma.
Definition.—Radial main spines with three rows of lateral branches (one row on each edge).