Original: In The Valley of Gwangi, Gwangi is billed as an Allosaurus, although Ray Harryhausen based his model for the creature on Charles R. Knight's depiction of a Tyrannosaurus.
Simplified: Gwangi is billed as an Allosaurus, though Ray Harryhausen based his model for the creature on Charles R. Knight's depiction of a Tyrannosaurus.