A new paper was just published which sheds some light on the controversy between Bourguignat and Crosse during the last half of the 19th century. This is a publication of the project on the history of European malacology.
Audibert, C., Backhuys, W. & Breure, A.S.H., 2017. ‘Une petite histoire malacologique’: two letters from Bourguignat to Crosse, or a story of friction between malacologists. – Journal of Conchology, 42: 407–411.