original description
Say, T. (1831). Description of several new species of shells, and of a new species of <i>Lumbricus</i>. <em>Transylvania Journal of Medicine and the Associate Sciences.</em> 4(4): 525-529., available online at https://babel.hathitrust.org/cgi/pt?id=nnc2.ark:/13960/t51g3h18z;view=1up;seq=533
page(s): 528-529 [details]
basis of record
InvertEBase. (2018). Authority files of U.S. and Canadian land and freshwater mollusks developed for the InvertEBase (InvertEBase.org) project. [details]
additional source
Bland, T. & Binney, W. G. (1871). On the lingual dentition of <i>Helicina occulta</i>. <em>American Journal of Conchology.</em> 7(1): 29-30, pl. 2, fig. 6., available online at https://www.biodiversitylibrary.org/page/15918163 [details]
additional source
Keyes, C. R. (1889). Note on the distribution of <i>Helicina occulta</i>. <em>The Nautilus.</em> 3(2): 18-19., available online at https://www.biodiversitylibrary.org/page/12596388 [details]
additional source
Pilsbry, H. A. (1889). Distribution of <i>Helicina occulta</i> Say. <em>The Nautilus.</em> 3(2): 20., available online at https://www.biodiversitylibrary.org/page/12596390 [details]
additional source
Marston, G. T. (1890). Occurrence of <i>Helicina occulta</i> Say, in Brown Co., Wis. <em>The Nautilus.</em> 3(10): 113., available online at https://www.biodiversitylibrary.org/page/12596542 [details]
additional source
Anonymous. (1892). <i>Helicina occulta</i> Say. <em>The Nautilus.</em> 6(2): 24., available online at https://www.biodiversitylibrary.org/page/42788974 [details]
From editor or global species database