Trionyx foveatus, Leidy, 1856

Leidy, J., 1856, Notice of remains of extinct reptiles and fishes, discovered by Dr. FV Hayden in the Bad Lands of the Judith River, Nebraska Territory., Proceedings of the Academy of Natural Sciences of Philadelphia 8, No. 7, pp. 72-73 : 73

6. Trionyx foveatus , Leidy.

The species is founded on fragments of several costal and sternal plates. The exterior surface of the eostal plates is eovered with pits, excepting close to the margins; and the pits are small and round at the vertebral extremity, and gradually increase in size outwardly and become antero-posteriorly oblong oval and reniform. A vertebral fragment of a third or fourth costal plate, a little over an inch in length, is 11 lines wide and 2 lines thick. Small fragments of the sternal plates present an exterior surface covered with broken vermicular ridges and tubercles separated by wide intervals. Fragments of a hyposternal plate are 3 lines in thickness.