MolluscaBase taxon details
original description
(of Helix polygyrella Bland & J. G. Cooper, 1861) Bland, T. & Cooper, J. G. (1861). Notice of land and freshwater shells collected by Dr. J. G. Cooper in the Rocky Mountains, etc., in 1860. <em>Annals of the Lyceum of Natural History of New York.</em> 7: 362-370., available online at https://www.biodiversitylibrary.org/page/16227827
page(s): 365, pl. 4, figs. 13-15 [details]
original description
(of Polygyrella polygyrella var. montanensis Ancey, 1887) Ancey, C. F. (1887). Description of North American shells. <em>The Conchologists' Exchange.</em> 2(6): 79-80.
page(s): 80 [details]
basis of record
Pilsbry, H. A. (1891). On <i>Helix harfordiana</i> Cooper, and other shells. <em>The Nautilus.</em> 5(4): 39-42, pl. 2., available online at https://www.biodiversitylibrary.org/page/42788782
page(s): 41-42 [details]
additional source
Pilsbry, H. A. (1932). <i>Polygyrella polygyrella</i>. <em>The Nautilus.</em> 46(2): 69., available online at https://www.biodiversitylibrary.org/page/8519416 [details]