Olsson, A. A., 1930. Contributions to the Tertiary Paleontology of Northern Peru: Part 3, The Eocene Mollusca. Bulletins of American Paleontology, 17 (62 ).
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New Species-Group Names:
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chiraensis Olsson, 1930. p. 39. pl. v. f. 1.4. 10.
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peruvianus Olsson, 1930. p. 40. pl. v. f. 13-15.