original description
Say, T. (1826). Descriptions of marine shells recently discovered on the coast of the United States. <em>Journal of the Academy of Natural Sciences of Philadelphia.</em> 5(2):207-221., available online at https://www.biodiversitylibrary.org/page/24657265
page(s): 207 [details]
additional source
Pilsbry, H. A. (1954). A long forgotten shell, <i>Delphinula laxa</i> Say. <em>The Nautilus.</em> 68(1): 10-11, fig. 1., available online at https://www.biodiversitylibrary.org/page/8516489
note: States that it was found on Sullivan Island, but not mentioned in original description [details]
additional source
Say, T. (1830-1834). American Conchology, or descriptions of the shells of North America. Illustrated by coloured figures from original drawings executed from nature. School Press, New Harmony, Indiana. Part 1 (1830a); Part 2 (April 1831a); Part 3 (September 1831a); Part 4 (March 1832); Part 5 (August 1832); Part 6 (April 1834); Part 7 (1834?, published after Say's death; edited by T. A. Conrad)., available online at http://biodiversitylibrary.org/page/7959266
page(s): pl. 7 [details]
From editor or global species database
Type locality on coast of South Carolina [details]