Procheneosaurus altidens (Lambe, 1902)

Figure 8W, X

Trachodon (Pteropelyx) altidens LAMBE, 1902, p. 76.

Procheneosaurus ? altidens: LULL AND WRIGHT, 1942, p. 222.

A crested ornithopod is indicated by a small group of teeth, AMNH 8527 from Clambank Hollow, which are markedly different from those of Kritosaurus (fig. 8W, X). The teeth are large, with a long, narrow and elongated enamel face having a prominently raised medial keel. Sides of the enamel face are ornamented toward the apex of the crown with small papillae. Unlike teeth of Kritosaurus, the crown is not diamondshaped but is rectangular in lateral view.

The teeth, which vary greatly in size, closely resemble teeth of Trachodon (Pteropelyx) altidens Lambe (1902, pl. 4, fig. 4). The species was later tentatively transferred to the genus Procheneosaurus by Lull and Wright (1942, pp. 222-223).