Heilprin, A., 1887. Fossils of the Silex-Bearing Marl (Miocene) of Ballast Point, Hillsboro Bay. Transactions of the Wagner Free Institute of Science of Philadelphia, 1: 105 -123 .
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New Species-Group Names:
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planiceps Heilprin, 1887. p. 110. f. 48.
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tryoni Heilprin, 1887. p. 82. f. 10.