Murex foliatus Gmelin, 1791 Murex monodon Eschscholtz, 1829 Purpura alata Schumacher, 1817 Ceratostoma foliatum, or leafy hornmouth is a species of medium to large sea snail, a marine gastropod mollusk in the family Muricidae, the rock snails.

This species lives in the Eastern Pacific.

Known from California, West coast of North America.

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