[1][2] It is native to the Eastern North Atlantic Ocean off the coast of Macaronesia and the Iberian Peninsula.

Its ground color is greenish, especially on the body whorl, usually purplish on the spire, and either: The pattern is sometimes so obscurely mottled, spirally and obliquely streaked, that it appears nearly uniform olivaceous, especially on the body whorl.

The base of the shell is somewhat convex, more or less impressed around the axis, sometimes eroded in front of the aperture.

The outer lip contains a black-spotted green edge, which is generally followed by a broad thin opaque-white band, within which it is nacreous and iridescent.

[3] This species occurs in the Eastern North Atlantic off the coast of the Iberian Peninsula (in mainland Portugal and Galicia) and in the Atlantic archipelagos of the Canary Islands, Madeira and eastern Azores.