Radial tubes without inflated terminal knob, forked at the tapering distal end, with two divergent curved branches of equal size. Proximal whorl cruciate, with four rather equal, crossed, straight, lateral branches (sometimes three or five instead of four in single tubes).
Dimensions.—Length of the tubes 2.0 to 2.5, breadth 0.03 to 0.04; branches 0.1 to 0.3.
Habitat.—North Pacific, Station 231, depth 2250 fathoms.
6. Aulospathis triodon, n. sp. (Pl. [104], fig. 8).
Radial tubes without inflated terminal knob, with three divergent, slightly curved, terminal branches. Proximal whorl with a variable number of curved lateral branches, usually also three (often two or four, rarely more).
Dimensions.—Length of the tubes 2 to 3, breadth 0.03 to 0.05; branches 0.2 to 0.3.
Habitat.—North Pacific, Stations 250 to 253, depth 2740 to 3125 fathoms.
7. Aulospathis tetrodon, n. sp. (Pl. [104], fig. 9).
Radial tubes without inflated terminal knob, with four crossed, divergent, slightly curved terminal branches. Proximal whorl usually with an irregular cross of four lateral branches (often five or six, rarely two or three instead of the usual four).
Dimensions.—Length of the tubes 2.0 to 2.5, breadth 0.03 to 0.04; branches 0.2 to 0.3.