Norwood, J.G. and Pratten, H. (1855). Notice of fossils from the Carboniferous Series of the Western States, belonging to the Genera Spirifer, Bellerophon, Pleurotomaria, Macrocheilus, Natica and Loxonema: with descriptions of eight new characteristics species. Journal of the Academy of Natural Sciences of Philadelphia, Series 2. 3: 71–79.
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Norwood, J.G. and Pratten, H.
1855
Notice of fossils from the Carboniferous Series of the Western States, belonging to the Genera Spirifer, Bellerophon, Pleurotomaria, Macrocheilus, Natica and Loxonema: with descriptions of eight new characteristics species
Journal of the Academy of Natural Sciences of Philadelphia, Series 2