is a small snail up to 5 mm high and 3 mm wide. There are 7-8 whorls, which have a convex profile. It occurs in two forms, one with smooth whorls (var. interrupta
) and one with vertical ridges (costae) on and after the 5th whorl. The shell is cream coloured to pale brown and has a lilac tint around the aperture. The body of the snail is yellow with black streaks and has long slender tentacles with an eye at the base of each.