Dimensions.—Diameter of the sphere 1.5 to 2; tangential tubes 0.12 to 0.16 long, 0.004 broad.
Habitat.—Mediterranean (Messina), surface.
11. Aulosphæra bisternaria, n. sp. (Pl. [109], figs. 11, 12).
Radial tubes cylindrical, straight, about as long as the cylindrical tangential tubes, smooth or somewhat thorny, armed at the distal end with two alternate verticils of three branches, which bear a terminal spathilla; the proximal branches are twice as long as the distal, and alternate with them regularly, so that the six branches lie in six different meridional planes.
Dimensions.—Diameter of the sphere 2.5; tangential tubes 0.2 long, 0.01 broad.
Habitat.—Antarctic Ocean, Station 156, surface.
12. Aulosphæra dendrophora, n. sp. (Pl. [109], figs. 1, 2).
Radial tubes cylindrical, straight, about as long as the cylindrical, smooth, tangential tubes, armed in the distal half with three verticils of four crossed branches; the four proximal branches are three times as long as the four distal, and twice as long as the four intermediate branches. All twelve branches bear a terminal spinulate knob, and lie in two perpendicularly crossed meridian planes.
Dimensions.—Diameter of the sphere 2.2 to 2.8; tangential tubes 0.2 long, 0.01 broad.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.