Galatea listens to the love song of Polyphemus while she and Acis lie hidden by a rock. In his song, Polyphemus scolds her for not loving him in return, offers her rustic gifts and points out what he considers his best feature — the single eye that is, he boasts, the size of a great shield. But when Polyphemus discovers the hiding place of the lovers, he becomes enraged with jealousy. Galatea, terrified, dives into the ocean, while the Cyclops wrenches off a piece of the mountain and crushes Acis with it. But on her return, Galatea changes her dead lover into the spirit of the Sicilian river Acis.