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 1880. Davidson, T. — Supp. to the Permian and Carboniferous 



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PL 30, figs. 12 a, b, c 

 1887. Oehlert, D. P. — Fischer's Manuel de Conchyliologie, 



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 1887. Waagan, W. — Palaeontologica Indica, Series 13, Salt 



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