It is ornamented with more or less distant, wide, compressed, smooth, parallel ribs, inclined towards the base, of a pale rose color, most commonly with quadrangular deep brown spots.

These ribs are pointed at their summit, and a little below these form a slight keel, caused by small asperities.

The ground color of the shell is whitish or violet, adorned with brown or reddish spots, forming regular festoons throughout its whole length.

There are found also upon the surface of the shell two or three bands, sometimes replaced by large spots, which alike surround it.

The large aperture is reddish, terminated at its base by an oblique, shallow emargination, marked within with brown spots or bands.