A drawing of <i><a href="https://en.wikipedia.org/wiki/Truncatella_bilabiata" class="extiw" title="en:Truncatella bilabiata">Truncatella bilabiata</a></i>, from p. 6 of: Bryant Walker, 1928. "The Terrestrial Shell-Bearing Mollusca of Alabama", Univ. Mich. Mus. Zool. Misc. Pub. 18.
Unknown author<span style="display: none;">Unknown author</span>
see above