Species: encaustus COPE, 1876 (nomen dubium)
Etymology: Greek, encaustus, "burnt in."

Holotype: AMNH 2479 (5739?)

Locality: Dog Creek, 6.4 km (4 mi) east of Judith River, Fergus County, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Tooth.
Note: A tyrannosaurid tooth was mixed in along with hadrosaur teeth.

_____________________________________________________________________________________

Species: bicarinatus COPE, 1876 (nomen dubium)
Etymology: Latin, bi, "two" and Latin, carinatus, "keeled."

Holotype: AMNH 3975

Locality: Dog Creek, 6.4 km (4 mi) east of the Judith River, Fergus County, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Tooth.

_____________________________________________________________________________________

Species: haydenianus COPE, 1876 (nomen dubium)
Etymology: In honor of Ferdinand Vandeveer Hayden (September 7, 1829 – December 22, 1887).

Holotype: AMNH 5738

Locality: Dog Creek, 6.4 km (4 mi) east of Judith River, Fergus County, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Teeth from 2 individuals.

_____________________________________________________________________________________

Species: peiganus COPE, 1876 (nomen dubium)
Etymology: In honor of Peigan Indian tribe (also spelled Piegan) who lived in the region of Montana where the fossil teeth were found

Holotype: AMNH 3974

Locality: Dog Creek, 6.4 km (4 mi) east of Judith River, Fergus County, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Tooth crown.