General Léon de Lamothe (1849–1936) is a French geologist and malacologist whose collections are housed in Muséum d’Histoire naturelle in Grenoble. He brought together a large collection, building upon his father’s collection. Benjamin de Lamothe (1799–1884) was a colonel and we know he had collected molluscs himself, as evidenced by some labels (“collection de mon père et recueilli par lui”). This collection contained a few hundreds lots of specimens. His son Léon increased this collection by collecting especially in Algeria, when he was there in garrison during the 1910s. With an important network of conchologists, he practiced exchanges and purchases to constitute a worlwide collection that contained both marine and continental, with local and exotical species. L. de Lamothe worked in close cooperation with Philippe Dautzenberg (1849–1935), the most frequent name who appears in his collection. Dautzenberg gave him (or exchanged with him) many specimens, identified his samples and validated them before publication (e.g.: de Lamothe published some catalogues for the Algerian malacofauna, in particular Arzew and Mostaganem).
Another important collaborator of de Lamothe was the Commandant L. Morlet (1823–1892) who provided him with many exotical species.
The names of many other collectors can also be found in his collection: General Léon de Beylié (1849–1910), a patron for Musée de Grenoble (ethnology and archeology), Captain Le Chatelier, Marquis de Monterosato, Henri Gouin, Chaper, Darbois, Flamand, Sowerby, Newcombe, Smith, etc. He purchased molluscs from Vigné, Géret and most of all, Boulanger. Ancey is mentioned as a persons who performed the determinations. Finally a large serie of molluscs came from the Gruvel mission in 1909–1910 (with Chudeau along the coast of the West African) and another from “Germain’s mission in 1907” (probably the mission of Chudeau in Lake Chad).
 Annotated copy of L. de Lamothe’s work about marine malacology in MHNGr.