Traits name details
original description
Girty, G. H. (1899). Preliminary report on Paleozoic invertebrate fossils from the region of the M'Alester coal field, Indian Territory. In: Walcott, C.D. Nineteenth Annual Report of the United States Geological Survey to the Secretary of the Interior 1897-98. Part III. Economic geology. Washington, Government Printing Office, 539-593. page(s): 583, pl. 72, fig. 6a [details]
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