Dysganus peiganus, Cope, 1876

Cope, E. D., 1876, Descriptions of some vertebrate remains from the Fort Union beds of Montana, Proceedings of the Academy of Natural Sciences of Philadelphia 28, pp. 248-261 : 252

Dysganus peiganus , sp.nov.

In the typical tooth of this species the form approaches the genus Palaeoscincus , Leidy, in the compression of the crown, and the contraction of the base; it is a limital species of Dysganus if really properly placed in that genus.

The widest portion of the crown is above the base; from this expansion it contracts in both directions, and in the unworn tooth forms an angular median apex. This is not the case in D. encaustus , which is regularly rounded. The margin of the crown is narrowed, expanding but little towards the expansion, and is quite rugose. From these rugosities low ridges descend on the face of the tooth, whose surface is also minutely rugose. The face is divided by a prominent median rib, which extends to the apex. No cementum is visible on the basis, in the only specimen in which this part is preserved.