Definition.—Distal ends of the radial tubes inflated, usually in the form of an ovate or pyriform terminal knob.
1. Aulospathis bifurca, n. sp. (Pl. [104], figs. 1-5).
Radial tubes with an inflated ovate terminal knob at the distal end, which bears two divergent, curved, terminal branches (often a few tubes bear three or four branches instead of the usual two). Proximal whorl usually cruciate, with four irregularly crossed lateral branches (but often with five or six, more rarely with two or three).
Dimensions.—Length of the tubes 0.15 to 25 mm., breadth 0.04 to 0.06; branches 0.1 to 0.15.
Habitat.—South Pacific, Stations 293 to 295, depth 1500 to 2270 fathoms.
2. Aulospathis trifurca, n. sp. (Pl. [104], figs. 6, 7, 7a).
Radial tubes with an inflated ovate terminal knob at the distal end, which bears three divergent, straight, or slightly curved terminal branches (often a few tubes bear two or four branches instead of the usual three). Proximal whorl irregular, usually with six divergent, straight, lateral branches.
Dimensions.—Length of the tubes 2.2 to 3.4, breadth 0.03 to 0.05; branches 0.1 to 0.15.
Habitat.—South Pacific (off Valparaiso), Stations 298 to 300, depth 1375 to 2225 fathoms.
3. Aulospathis quadrifurca, n. sp.