T. A.  Conrad, ?Observations on the Eocene formation, and descriptions of one hundred and five new species of that period, from the vicinity of Vicksburg, Mississippi, with an Appendix?, Proceedings of the Academy of Natural Sciences of Philadelphia, vol. 3, pp. 280?299, 1847.

T. A.  Conrad, ?Descriptions of eighteen new Cretaceous and Tertiary fossils, {&}c?, Proceedings of the Academy of Natural Sciences of Philadelphia, vol. 7, pp. 265?268, 1855.