van der Spoel, 1968
Diagnosis: Shell red-brown, globular with rounded ventral and dorsal sides and well-developed ribs. Lateral sides curved and thickened between lateral spines and corners of caudal spine mark. Shell sculpture consisting of faint growth lines and 3 dorsal, moderately developed striae. Lateral spines small, caudal spine absent as protoconch is discarded leaving oval spine mark. Dorsal lip arch-shaped bordering very narrow shell aperture. Aperture lips thickened. Shell length 2.1 mm, width 1.7, the diameter of the caudal spine mark is 0.56-0.80 mm. Subtropical and equatorial forms of this species (Van Leyen and van der Spoel, 1982) differ only in size.