Habitat.—North-west Pacific (off Japan), Station 231, depth 2250 fathoms.
16. Aulographis triangulum, n. sp. (Pl. [103], fig. 15).
Radial tubes cylindrical, slender, straight. Terminal branches constantly three, slender, slightly curved, nearly horizontally (tangentially) expanded, eight to ten times as long as the tube is broad, with a terminal spathilla of four recurved teeth which are opposite in pairs. Since the angles between the three branches are equal (= 120°) they correspond to the axes of an equilateral triangle.
Dimensions.—Length of the tubes 1.2, breadth 0.015 to 0.02; branches 0.1 to 0.12.
Habitat.—South Pacific, Station 289, depth 2550 fathoms.
17. Aulographis tetrancistra, n. sp. (Pl. [103], fig. 22).
Radial tubes slender, cylindrical, straight. Terminal branches four to six (usually four), eight to ten times as long as the tube is broad, slightly curved and widely divergent, with a terminal spathilla of four crossed recurved teeth.
Dimensions.—Length of the tubes 0.5 to 0.7, breadth 0.01; branches 0.08 to 0.1.
Habitat.—South Pacific, Station 285, depth 2375 fathoms.
18. Aulographis hexancistra, n. sp. (Pl. [103], figs. 18, 19).