Radial tubes cylindro-conical, twice as long as the thorny pyramidal tubes, studded with numerous curved spines, and armed with a verticil or corona of numerous (twenty to thirty or more) undulate, divergent, pointed, terminal branches.
Dimensions.—Diameter of the sphere 3.0; radial tubes 0.3 to 0.4 long, 0.02 to 0.03 broad.
Habitat.—North Pacific, Station 252, surface.
8. Auloscena gigantea, n. sp. (Pl. [110], fig. 7).
Radial tubes cylindrical, thorny, about as long as the thorny pyramidal tubes, armed in the distal half with four to eight verticils of short curved ciliæ, and at the distal end with a similar small terminal verticil.
Dimensions.—Diameter of the sphere 5.2; pyramidal tubes 0.2 to 0.3 long, 0.01 broad.
Habitat.—Central Pacific, Stations 265 to 268, surface.
9. Auloscena arboretum, n. sp.
Radial tubes cylindrical, straight or slightly curved, about the same length as the smooth pyramidal tubes; armed in the distal half with three or four verticils, tapering in size towards the distal end; each verticil is composed of four crossed and curved branches, which bear a terminal spinulate knob. (This species is very similar to Aulosphæra dendrophora, Pl. [109], fig. 1, and may be derived from it by elevation of the hexagonal pyramids, which in the latter lie in the spherical plane).
Dimensions.—Diameter of the sphere 4.4; pyramidal tubes 0.25 long, 0.01 broad.