2. Cubotholus quadraticus, n. sp.
Surface of the shell smooth. Both principal cupolas (on the poles of the longitudinal axis) larger than the four other cupolas, which have the same size and lie cross-wise in the equatorial plane. (Therefore two of the three fundamental axes equal, the third larger.) Pores subregular, circular, three times as broad as the bars; ten to twelve in the semicircle of each cupola-basis.
Dimensions.—Major axis 0.16, minor axis 0.12; pores 0.012, bars 0.004.
Habitat.—Indian Ocean, Zanzibar, Pullen; depth 2200 fathoms.
3. Cubotholus rhombicus, n. sp.
Surface of the shell smooth. Both principal cupolas (on the poles of the longitudinal axis) larger than the two lateral (on the poles of the transverse axis), and these larger than the two sagittal cupolas (on the poles of the sagittal axis). Therefore all three fundamental axes unequal. Pores irregular, roundish, twice to four times as broad as the bars; eight to twelve in the basal semicircle of each cupola. Medullary shell lentelliptical.
Dimensions.—Major (principal) axis 0.16, middle (lateral) axis 0.14, minor (sagittal) axis 0.12; pores 0.006 to 0.012, bars 0.003.
Habitat.—South Atlantic, Station 335, depth 1425 fathoms.
Subgenus 2. Cubotholura, Haeckel.
Definition.—Surface of the shell with radial spines or thorns.