Radial tubes with an inflated ovate terminal knob at the distal end, which bears four crossed, divergent, curved terminal branches. Proximal whorl also rather regular, with a cross of four straight lateral branches.
Dimensions.—Length of the tubes 3.0 to 4.0, breadth 0.04 to 0.08; branches 0.2 to 0.3.
Habitat.—South Pacific, Station 291, depth 2250 fathoms.
4. Aulospathis polymorpha, n. sp. (Pl. [104], figs. 10-13).
Radial tubes with an inflated ovate terminal knob at the distal end, which bears a variable number of divergent, curved, irregular, terminal branches. Usually the majority of the tubes bear three branches, whilst others exhibit two or four, sometimes also five or six. Proximal whorl also very variable and irregular, with two to six, usually three or four unequal branches.
Dimensions.—Length of the tubes 2.0 to 4.0, breadth 0.04 to 0.06; branches 0.1 to 0.3.
Habitat.—South Pacific, Station 289, depth 2550 fathoms.
Subgenus 2. Aulospathilla, Haeckel.
Definition.—Distal ends of the radial tubes of equal breadth or tapering gradually, not inflated, without terminal knobs.
5. Aulospathis diodon, n. sp.