The medal was struck in connection with the ‘Darwin Prize’ instituted by the Midland Union of Natural History Societies (see Correspondence vol. 28, letter from E. W. Badger, 17 July 1880). The die for the medal was cut by Joseph Moore; one side showed a bust of CD and the other showed a branch of coral (Midland Naturalist 5 (1882): 159). The proof has not been found in the Darwin Archive–CUL.