Strophiops (Strophiops) lacunorum Dall,1905
Cerion (Strophiops) inconspicuum new species. Pl. LVIII, figs. 2, 4.
Shell small, white or pale brownish, bluntly spindle-shaped, with about two smooth nuclear and six or seven subsequent whorls; apex arcuately tapering; last whorl moderately attenuated, and, at its termination, ascending a little above the middle of the whorl; umbilicus showing a small open chink; peristome simple, slightly thickened and reflected; the ribs are narrow, small, low and separated by about equal interspaces, slightly oblique and very regular; there is no spiral sculpture. The nuclear shell has two short parietal, and one similar basal denticle; the adult has the single parietal denticle short, feeble, and pustular, the axial lamina almost obsolete.
A variety lacunorum, is larger, heavier, and with the parietal and axial laminae well developed. The measurements are of extremes:
Shell Aperture Max Diameter
Type. . . . . . . . . 17.0 5.5 6.5-8.0 mm.
Variety. . . . . . .. 20.0 6.5 8.5 "
" . . . . . . .. 17.5 5.7 8.5 "
Watling Island, U. S. Fish Commission; the variety on the shores of the lagoon by Dr. J. J. Brown; U. S. Nat. Mus., No. 127,494. The types No. 37,676.