Dimensions.—Length of the central chamber 0.03, breadth 0.02; length of the lateral girdle 0.09, breadth 0.06; height of the gates 0.02, breadth 0.038.
Habitat.—South Pacific, Station 288, surface.
3. Dizonium transversum, n. sp.
Central chamber of the shell spherical, rough, with five to six pores on the half equator. Lateral girdle transverse-elliptical, so that its longer axis corresponds to the lateral axis of the transverse girdle, and equals four times the diameter of the central chamber. Four gates kidney-shaped, four times as broad as high. No radial spines.
Dimensions.—Diameter of the central chamber 0.02; length of the lateral girdle 0.05, breadth 0.08; height of the gates 0.01, breadth 0.04.
Habitat.—Pacific, central area, Station 274, depth 2750 fathoms.
Subgenus 2. Dizonitis, Haeckel.
Definition.—Shell with radial spines or thorns, symmetrically disposed.
4. Dizonium pleuracanthum, n. sp. (Pl. [9], fig. 2).
Central chamber of the shell nearly spherical, smooth. Lateral girdle elliptical, one and a third times as long as broad, three times as long as the central chamber. Four gates transverse-elliptical, one and a half times as broad as high. Two conical spines, opposite on the poles of the lateral axis.