In 1911 Aleksander Stenbock-Fermor, a Russian aristocrat, offered the Muséum National d'Histoire Naturelle, Paris, a well-preserved mammoth from Lyakhowskiy Island, New Siberian Isles. This paper presents a hitherto unpublished memorandum that Stenbock-Fermor addressed to Edmond Perrier, the Museum's director, which related the circumstances surrounding the discovery, removal and transportation of the mammoth from Siberia to St Petersburg and thence to Paris. The paper also presents some biographical information on Konstany Wołłossowicz, who explored Siberia and who organized the expedition to Lyakhowskiy Island in order to bring the mammoth to Europe.