Phorcus punctulatus, common name the punctate monodont, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

The surface is nearly smooth, sometimes showing traces of spiral grooves, which are always visible on the young.

The base of the shell is convex, eroded and white in front of the aperture.

The outer lip is not much thickened, edged with black, beautifully iridescent within, with amethystine tints.

The columella is short, obtusely subdentate at the base, expanding above into a callus, which covers the axis and the umbilicus, or leaves a slight excavation or groove.