Dimensions.—Diameter of the outer shell 0.08, of the inner 0.04.
Habitat.—North Pacific, Station 256, surface.
3. Phractopelta diporaspis, n. sp.
Outer shell composed of twenty plates, the meeting condyles of which are separated by permanent sutures. Each plate commonly with two quadrangular aspinal pores, which are four to five times as broad as the irregular sutural pores. Radial spines compressed, sword-shaped, about as long as the diameter of the shell.
Dimensions.—Diameter of the outer shell 0.09, of the inner 0.04.
Habitat.—South Atlantic, Station 332, surface.
4. Phractopelta tessaraspis, n. sp.
Outer shell composed of twenty plates, the meeting condyles of which are separated by permanent sutures. Each plate commonly with four crossed, quadrangular, aspinal pores, the two opposite of which are much larger than the two others. Sutural pores small, roundish. Radial spines compressed, linear, about twice as long as the diameter of the shell.
Dimensions.—Diameter of the outer shell 0.084, of the inner 0.032.
Habitat.—North Pacific (off Japan), Station 238, surface.