Olsson, A. A., and Harbison, A., 1953. Pliocene Mollusca of Southern Florida with Special Reference to those from North Saint Petersburg. Monographs of the Academy of Natural Sciences of Philadelphia, 8.
New Species-Group Names:
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robertsi Olsson & Harbison, 1953. p. 175. pl. 26. f. 3.
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spuroides Olsson & Harbison, 1953. p. 172. pl. 26. f. 1-1d.