Microscope slides found in the collection of Elon E. Byrd and labeled only as from “the intestine of Chelydra serpentina L.,” contained 12 specimens of digenetic trematodes that are identified herein as Echinochasmus sp. (Digenea: Echinostomatidae). Three specimens suitable for complete examination and measurement possess 20 collar spines with 1 angle spine and are most similar to Echinochasmus leopoldinae Scholz, Ditrich and Vargas-Váquez, 1996. The small sample size, condition of the specimens, and several morphometric differences preclude species identification. This is the first report of the adults of Echinochasmus from a reptile. Because these worms were collected from 2 snapping turtles and are in excellent condition, the infections could represent an occurrence of postcyclic transmission.