6. Dorataspis micropora, n. sp. (Pl. [138], fig. 3).
Shell with fifty-four sutures and fifty-four very small sutural meshes, with eight hexagonal and twelve pentagonal plates. Both aspinal meshes of each plate elliptical, four to six times as broad as the sutural meshes. Radial spines in the outer half conical, somewhat shorter than in the inner cylindrical half.
Dimensions.—Diameter of the shell 0.11, of the aspinal pores 0.01 to 0.02, of the sutural pores 0.003.
Habitat.—North Pacific, Station 244, depth 2900 fathoms.
7. Dorataspis gladiata, n. sp.
Shell with fifty-four sutures and one hundred to one hundred and twenty sutural meshes, with eight hexagonal and twelve pentagonal plates. Both aspinal meshes elliptical, three times as broad as the small sutural meshes; commonly two meshes in each suture. Radial spines sword-shaped, two-edged, tapering from the shell towards the two ends. (Resembles Belonaspis datura, Pl. [139], fig. 9, but differs in the spherical shell, the equal size of the four equatorial spines, and the absence of by-spines.)
Dimensions.—Diameter of the shell 0.12, of the aspinal pores 0.012, of the sutural pores 0.004.
Habitat.—Indian Ocean (Madagascar), Rabbe, surface.
8. Dorataspis polypora, n. sp.
Shell with fifty-four sutures and one hundred and sixty to two hundred sutural meshes, with eight hexagonal and twelve pentagonal plates. Commonly three meshes (sometimes four) on each suture. Both aspinal meshes kidney-shaped, four times as broad as the small sutural meshes. Radial spines thick, in the inner longer part cylindrical, in the outer shorter part conical. (Differs from all other species in the multiplication of the sutural pores.)