Brown, A. P. & Pilsbry, H. A. (1911). Fauna of the Gatun formation, Isthmus of Panama. Proceedings of the Academy of Natural Sciences of Philadelphia. 63: 336-373, pls. 22-29.
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Brown, A. P. & Pilsbry, H. A.
1911
Fauna of the Gatun formation, Isthmus of Panama.
Proceedings of the Academy of Natural Sciences of Philadelphia