Radial tubes club-shaped, robust, straight, gradually thickened towards the distal end. Terminal branches eight to ten (usually nine), conical, smooth, slightly curved, divergent outwards like a regular corona.
Dimensions.—Length of the tubes 0.5 to 0.6, distal breadth 0.04; branches 0.08.
Habitat.—North Atlantic, Station 354, depth 1675 fathoms.
Subgenus 2. Aulographella, Haeckel.
Definition.—Terminal branches of the radial tubes without terminal spathillæ, but with lateral teeth or secondary spines. (Tubes usually very stout and robust, club-shaped.)
10. Aulographis triæna, n. sp. (Pl. [105], fig. 8).
Radial tubes club-shaped, straight, tapering gradually towards the rounded proximal end. Terminal branches constantly three, divergent, very stout, eight to ten times as long as the breadth of the tube, each studded with three to six irregular, conical, secondary spines. Sometimes the branches become forked, the species passing over into Auloceros cervinus.
Dimensions.—Length of the tubes 1.2 to 1.5, breadth 0.004 to 0.06; branches 0.3 to 0.5.
Habitat.—South Pacific, Station 299, depth 2160 fathoms.
11. Aulographis martagon, n. sp. (Pl. [105], fig. 7).