Walcott, C. D. (1884). Paleontology of the Eureka district. <em>United States Geological Survey Monograph.</em> 8(8): 1-298., available online athttps://biodiversitylibrary.org/page/19654888 page(s): 15, pl. IX, fig. 6 [details]
original descriptionWalcott, C. D. (1884). Paleontology of the Eureka district. <em>United States Geological Survey Monograph.</em> 8(8): 1-298., available online athttps://biodiversitylibrary.org/page/19654888 page(s): 15, pl. IX, fig. 6 [details]
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