Species: occidentalis LEIDY, 1856 (nomen dubium)
Etymology: Latin, occidentalis, "western."
= Hadrosaurus occidentalis (LEIDY, 1856) (nomen dubium)
= Trachodon occidentalis (LEIDY, 1856) KUHN, 1936 (nomen dubium)

Cotypes: USNM 219, 220, 221

Locality: Grand River, South Dakota.

Horizon: Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

USNM 219: Posterior caudal vertebra (A).

USNM 220: Proximal median phalanx of pes (B).

USNM 221: Anterior caudal vertebra (C).