Brown, A. P., and Pilsbry, H. A., 1911. Fauna of the Gatun Formation, Isthumus of Panama. Proceedings of the Academy of Natural Sciences of Philadelphia, 63: 336 -373 .
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New Species-Group Names:
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aemulator Brown & Pilsbry, 1911. p. 342. pl. 23. f. 9.
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concavitectum Brown & Pilsbry, 1911. p. 341. pl. 23. f. 5. 6.
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gaza Johnson & Pilsbry, 1911. p. 342. pl. 23. f. 2. 3.
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imitator Brown & Pilsbry, 1911. p. 342. pl. 23. f. 4.
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molis Brown & Pilsbry, 1911. p. 343. pl. 23. f. 1.