Pistris, Pistrix, Pristis, or Pristrix.

The sea-monster sent to devour Andromʹeda. In ancient art it is represented with a dragon’s head, the neck and head of a beast, fins for the forelegs, and the body and tail of a fish. In Christian art the pistris was usually employed to represent the whale which swallowed Jonah. (Aratus: Contmentaries.) Aratus died A.D. 213.