original description(ofHelix trailli L. Pfeiffer, 1855)Pfeiffer, L. (1855). Description of nine new species of Helicea, from Mr. Cuming's collection. <em>Proceedings of the Zoological Society of London.</em> 23: 106–108, pl. 32. London [13 August]., available online athttps://www.biodiversitylibrary.org/page/30747991 page(s): 107, pl. 32, fig. 4 [details]
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