The spire, in descriptions, includes all the volutions above the aperture.
Shell with bands of tessellated brown or purple spots; suture slightly channelled; margin of the volutions convex.
Mitre, with the epidermis marbled with brownish-yellow; volutions at their base black; columella five-plaited.
Shell nearly smooth; upper margin of the volutions prominent; basal whorl contracted in the middle.
The volutions of the spire are somewhat convex; the coloured lines are not indented.
The deviation from the regular spire only taking place after the few first volutions.
A solid column formed by the inner sides of the volutions of a spiral univalve.
Applied to shells when ornamented with a series of points, tubercles, &c., round the upper edges of the volutions.
The hollow formed in spiral shells when the inner side of the volutions do not join each other, so that the axis is hollow.