Morrison, J.P.E. 1946. The nonmarine mollusks of San Jóse Island, with notes on those of Pedro González Island, Pearl Islands, Panamá. Smithsonian Miscellaneous Collections 106(6). 49 pp. https://www.biodiversitylibrary.org/page/27394380.
Morrison, 1946. Smithsonian Misc. Coll. 106(6): 46, pl. 1, figs. 4, 7.
Morrison, 1946. Smithsonian Misc. Coll. 106(6): 45, pl. 1, figs. 8-11.
Morrison, 1946. Smithsonian Misc. Coll. 106(6): 44, pl. 1, figs. 12-14.