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).
Radial tubes cylindrical, straight, smooth, two to three times as long as the smooth, cylindrical, tangential tubes; armed at the distal end with three divergent terminal teeth, which are straight or slightly curved and about one-third as long as the tube.
Dimensions.—Diameter of the sphere 1.2; tangential tubes 0.1 long, 0.01 broad.
Habitat.—North-Eastern Pacific (off Japan), Station 231, surface.
5. Aulosphæra tetrodon, n. sp.
Radial tubes slender, cylindrical, straight, smooth, about three times as long as the smooth, cylindrical, tangential tubes; armed at the distal end with a regular cross of four terminal teeth, which are directed almost horizontally, and are slightly recurved (just as in Aulosphæra spathillata, Pl. 109, fig. 7, but longer and without lateral verticils).
Dimensions.—Diameter of the sphere 1.6; tangential tubes 0.15 long, 0.005 broad.
Habitat.—South Pacific, Station 289, depth 2550 fathoms.
6. Aulosphæra polyodon, n. sp.
Radial tubes slender, spindle-shaped, gradually tapering towards the two ends, smooth, about twice as long as the cylindrical, smooth, tangential tubes; armed at the distal end with a verticil of twelve to twenty or more divergent, conical, slightly curved teeth.
Dimensions.—Diameter of the sphere 3.3; tangential tubes 0.2 long, 0.01 broad.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
Subgenus 3. Aulosphærissa, Haeckel.
Definition.—Radial tubes verticillate, armed with a variable number of regular verticils of lateral branches.
