Meek, F.B.; Hayden, F.V. (1856). Descriptions of twenty-eight new species of Acephala and one Gasteropod, from the Cretaceous formations of Nebraska Territory. Proceedings of the Academy of Natural Sciences of Philadelphia. 8: 81-87.
366576
Meek, F.B.; Hayden, F.V.
1856
Descriptions of twenty-eight new species of Acephala and one Gasteropod, from the Cretaceous formations of Nebraska Territory
Proceedings of the Academy of Natural Sciences of Philadelphia