And therein dwelleth Scylla, yelping terribly ... and on each a hideous head, and therein three rows of teeth set thick and close, full of black death. Up to her middle is she sunk far down ...

In Greek mythology, Scylla is a fearsome sea creature with a woman’s upper body and a lower body encircled by the heads of six wild dogs. According to Homer’s Odyssey, she lives in a cave ...