Arms lanceolate, three times as long as broad, in their middle part three times as broad as at both ends; their greatest breadth nearly equals the diameter of the central disk. (The arms have the same form as in Euchitonia lanceolata, Pl. [43], fig. 9.) Edges of the arms convex.
Dimensions.—Radius of each arm 0.3, greatest breadth (in the middle part) 0.08.
Habitat.—Pacific, central area, Station 273, depth 2350 fathoms.
3. Stauralastrum ordo, n. sp.
Arms trapezoid, about as long as broad, twice as broad at their truncated distal end as at the base; their basal breadth equals the radius of the central disk, which exhibits two to three rings. (The arms have nearly the same form as those in Hagiastrum mosis, Pl. [45], fig. 3.) Edges of the arms rectilinear, divergent towards the ends.
Dimensions.—Radius of each arm 0.12, basal breadth 0.04, distal breadth 0.08.
Habitat.—Pacific, central area, Station 265, depth 2900 fathoms.
4. Stauralastrum clavigerum, n. sp.
Arms twice as long as broad, in their distal half lenticular, nearly circular, twice as broad as in their square proximal half; their distal breadth equals the diameter of the central disk, which exhibits three to four rings. Edges of the arms concave.
Dimensions.—Radius of each arm 0.2, basal breadth 0.04, distal breadth 0.08.