Drupa morum, common name the purple drupe, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

[1] Thick, globose shell, up to 5 cm, with low spire, large body whorl and flat base.

Colour white with dark brown nodules.

Dark violet, narrow aperture with conspicuous groups of denticles.

[1] Habitat of Drupa morum include rocky shores[1] and in crevices among lower eulittoral rocks.