The shell is whitish where the outer coloured surface is eroded to reveal the lower layer of shell or where extensive damage has been repaired because only the leading edge of the mantle at the aperture rim can create the glossy yellow outer shell layer and periostracum .
1: broken edge of destroyed whorl.
2: part of whorl originally hidden by lost whorl and left exposed by shift of position by replacement whorl.
3: whitish replacement whorl lacking glossy yellow outer layer.
4: five brown spiral bands on body whorl; varies nought to five. Some bands hidden on earlier whorls by overlapping of subsequent whorls.
5: lower whitish layer of shell exposed by erosion of outer coloured surface.
6: shell near new rim is glossy yellow as formed by leading edge of mantle.

marinvert.senckenberg.science/image-browse/