original description(ofHelix alternata var. costata J. Lewis, 1871)Lewis, J. (1871). Notes on the land shells of east Tennessee. American Journal of Conchology, 6(3): 188-191, plate 12. page(s): 188 [details]
basis of recordClapp, G. H. (1899). Notes on two varieties of <i>Pyramidula</i> (<i>Patula</i>) <i>alternata</i> (Say). <em>The Nautilus.</em> 13(4): 41-42., available online athttps://www.biodiversitylibrary.org/page/42799941[details]
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