Radial tubes slenderly conical, smooth, gradually tapering towards the distal end, more or less irregularly curved, two to three times as long as the tangential tubes, which are cylindrical, straight and smooth.
Dimensions.—Diameter of the sphere 2.2; tangential tubes 0.15 long, 0.006 broad.
Habitat.—North Atlantic, Færöe Channel (Gulf Stream), John Murray, surface.
Subgenus 2. Aulosphærella, Haeckel.
Definition.—Radial tubes smooth, without lateral branches or spines, but armed with a verticil of teeth at the distal end.
3. Aulosphæra diodon, n. sp.
Radial tubes cylindro-conical, straight, smooth, of the same length as the smooth, cylindrical, tangential tubes; armed at the distal end with two divergent terminal teeth, which are slightly curved, pincer-shaped, and about one-fourth as long as the tube.
Dimensions.—Diameter of the sphere 2.5; tangential tubes 0.16 long, 0.003 broad.
Habitat.—South Atlantic, Station 332, depth 2200 fathoms.
4. Aulosphæra triodon, n. sp. (Pl. [109], fig. 8).