The Scotch Bonnet is one and a half to four inches long, cream in colour with spiral rows of rectangular brown spots. The depths of the spiral grooves vary and some specimens may be almost smooth, while in others, the grooves may be deeply etched. Three to six inches in length varying in colour, usually cream with narrow dark brown spiral bands.
Some specimens are entirely cream or dark brown.
The shell has three axial varices with many frond like spines. The development of the spines varies greatly among individuals.