MolluscaBase name details
original description
Say, T. (1817). Descriptions of seven species of American fresh water and land shells, not noticed in the systems. <em>Journal of the Academy of Natural Sciences.</em> Philadelphia 1(1): 13–16, 17–18., available online at http://archive.org/stream/journalofacademy01acaduoft#page/n21/mode/2up
page(s): 18 [details]
additional source
Kennard, A. S. & Woodward, B. B. (1925). On the <i>Helix perspectiva</i> of Megerle von Muhlfeld versus that of Say. <em>The Nautilus.</em> 38(3): 85-86., available online at https://www.biodiversitylibrary.org/page/8525066 [details]
source of synonymy
Pilsbry, H. A. (1948). Land Mollusca of North America (north of Mexico). Volume II Part 2. <em>The Academy of Natural Sciences of Philadelphia Monographs.</em> 3: i-xlvii, 521-1113. Philadelphia [19 March].
page(s): 608 [details] Available for editors [request]