Habitat.—Pacific, central area, Station 268, depth 2900 fathoms.
5. Stauralastrum dilatatum, n. sp.
Arms of nearly equal length and breadth, at their convex distal end three times as broad as at their narrow base; their distal breadth three times as large as the radius of the central disk, which exhibits three to four rings. (Resembles Histiastrum quadrigatum, Pl. [46], fig. 3, but has no patagium.) Edges of the arms concave.
Dimensions.—Radius of each arm 0.15, basal breadth 0.04, terminal breadth 0.12.
Habitat.—South Pacific, Station 300, depth 1375 fathoms.
Subgenus 2. Stauralastromma, Haeckel.
Definition.—Ends of the arms with one or more terminal spines.
6. Stauralastrum rhopalophorum, n. sp. (Pl. [45], fig. 1).
Hagiastrum rhopalophorum, Haeckel, 1881, Prodromus, p. 460.
Arms cylindrical, eight times as long as broad at their base, at their distal end club-shaped, three times as broad as at their base; their distal breadth twice as large as the diameter of the central disk, which exhibits two to three rings. Surface thorny, with larger spines towards the end, and one radial, very strong, angular terminal spine. Edges of the arms parallel.