Dimensions.—Length of the spines 0.5, breadth 0.03; distance of the apophyses from the centre 0.2.
Habitat.—Central Pacific, Station 272, surface.
3. Stauracantha diplostaura, n. sp.
Spines four-sided prismatic, with truncated apex and broad basal leaf-cross; in the proximal half with four slender conical apophyses. Each apophysis is crossed in its apical half at right angles by two short parallel transverse rods.
Dimensions.—Length of the spines 0.32, breadth 0.012; distance of the apophyses from the centre 0.11.
Habitat.—South Pacific, Station 291, surface.
4. Stauracantha scalaris, n. sp.
Spines four-winged prismatic, with four broad prominent edges, truncated apex, and small basal leaf-cross; in the proximal third with four compressed lamellar apophyses. Each apophysis is pinnate with opposite pinnulæ, or crossed at right angles by three to six parallel transverse rods.
Dimensions.—Length of the spines 0.24, breadth 0.016; central distance of the apophyses 0.12.
Habitat.—Indian Ocean (Madagascar), Rabbe, surface.