An extraordinary shell, sometimes called the antique lamp from its form.
Shell orbicular, the spire convex and obtuse; aperture round, toothed
within, grinning, turned upward to the spire; margin reflected.
Anostoma depressa.
Anostoma globulosa.
_A. depressa._ The depressed Anostoma.
Sub-globular, depressed and sub-carinated in its circumference, not
umbilicated; aperture round, the margin continued by a callosity,
toothed, thickened, and turned towards the back of the shell.
_A. globulosa._ The globular Anostoma.
Globose, with two small punctures, one on each side of the lip; slightly
carinated, smooth, and white; margin reflected.