Williamson, W.C. 1836. On the limestones found in the vicinity of Manchester. The London and Edinburgh Philosophical Magazine and Journal of Science 9 (series 3): 241-249, 348-356. https://www.biodiversitylibrary.org/page/15684926.
(homonym of Unio phillipsii Conrad, 1835)
Williamson, 1836. The London and Edinburgh Philosophical Magazine and Journal of Science 9: 351.