Habitat.—North Pacific, Station 253, depth 3125 fathoms.
Subgenus 2. Staurexodiscus, Haeckel.
Definition.—Internal cavity of the shell without centripetal axial rods.
2. Crucidiscus cuspidatus, n. sp.
Disk with smooth surface and simple smooth margin. Pores regular, circular; seven to eight on the radius of the disk. Four crossed spines pyramidal, with prominent edges, somewhat shorter than the radius of the disk, twice as broad at their thick base as one pore. No internal axial rods in the shell cavity.
Dimensions.—Diameter of the disk 0.12, of the pores 0.005; length of the spines 0.05, basal breadth 0.025.
Habitat.—Pacific, central area, Station 268, depth 2900 fathoms.
3. Crucidiscus echinatus, n. sp.
Disk with thorny surface and thorny margin. Pores regular, circular, six to seven on the radius. Four crossed spines pyramidal (four sided?), about as long as the radius of the disk, as broad at their base as one pore. No internal axial rods. Spines of the surface short, conical.
Dimensions.—Diameter of the disk 0.14, of the pores 0.008; length of the spines 0.08, basal breadth 0.02.