MolluscaBase taxon details
original description
(of Helix fidelis J. E. Gray, 1834) Gray, J. E. (1834). [Exhibition of an extensive series of land and freshwater shells regarded as hitherto undescribed]. <em>Proceedings of the Zoological Society of London.</em> (1834) 2: 63-68., available online at https://biodiversitylibrary.org/page/12859659
page(s): 67 [details]
original description
(of Helix nuttalliana I. Lea, 1838) Lea, I. (1838). Description of new freshwater and land shells. <em>Transactions of the American Philosophical Society.</em> new ser., 6: 1-154, plates 1-24., available online at https://www.biodiversitylibrary.org/page/26881423
page(s): 88, pl. 23, fig. 74 [details]
original description
(of Helix oregonensis I. Lea, 1838) Lea, I. (1838). Description of new freshwater and land shells. <em>Transactions of the American Philosophical Society.</em> new ser., 6: 1-154, plates 1-24., available online at https://www.biodiversitylibrary.org/page/26881423
page(s): 100, pl. 23, fig. 85 [details]
original description
(of Monadenia semialba J. Henderson, 1929) Henderson, J. (1929). Some new forms of non-marine Mollusca from Oregon and Washington. <em>The Nautilus.</em> 42(3): 80-82., available online at https://www.biodiversitylibrary.org/page/8518859
page(s): 80 [details]
original description
(of Monadenia fidelis columbiana Pilsbry, 1939) Pilsbry, H. A. (1939). Land Mollusca of North America (north of Mexico). Volume I Part 1. <em>The Academy of Natural Sciences of Philadelphia Monographs.</em> 3: i-xvii, 1-573, i-ix. Philadelphia [6 December].
page(s): 43, figs. 16h [details] Available for editors [request]
basis of record
InvertEBase. (2018). Authority files of U.S. and Canadian land and freshwater mollusks developed for the InvertEBase (InvertEBase.org) project. [details]