drawing of the shell of <i><a href="//commons.wikimedia.org/w/index.php?title=Neohelix_albolabris&amp;action=edit&amp;redlink=1" class="new" title="Neohelix albolabris (page does not exist)">Neohelix albolabris</a></i> (in the source book mentined as <i>Polygyra albolabris</i>)
<a href="//commons.wikimedia.org/w/index.php?title=W._H._Dall&amp;action=edit&amp;redlink=1" class="new" title="W. H. Dall (page does not exist)">W. H. Dall</a> (1845-1927)
W. H. Dall: <i>Alaska, Volume XIII, Land and Fresh Water Mollusks</i>. 1905, New York, Daubleday, Page &amp; Complany, pages 1-157, page 26. <a rel="nofollow" class="external free" href="https://archive.org/details/alaskaexp13harruoft">https://archive.org/details/alaskaexp13harruoft</a>