If a jealous one-eyed monster heaved a boulder at your lover, resulting in his mortal injury, a modern girl might engage a lawyer or a hit man. But the fair Nereid Galatea does not resort to restraining orders or threats of vengeance, instead turning spilled blood into a deathless river that flows eternally. Mark Morris Dance Group, making one of its periodic swings westward, presents the world premiere of Morris' Acis and Galatea. Based on the poem by Ovid, the story of grief transformed into glory inspired an opera by Handel that was jazzed up by Mozart in 1788. The new production gets costumes by fashion designer Isaac Mizrahi, sets designed by Adrianne Lobel, the Philharmonia Baroque Orchestra under the baton of Nicholas McGegan, and 18 of Morris' nimble dancers circling and swooping about the stage. Sherezade Panthaki sings the role of Galatea; Thomas Cooley plays her doomed lover Acis.