Abstract Specimens initially collected but not reported from the original type locality of Cornwallius sookensis (Mammalia, Desmostylia) have been found at the National Museum of Natural History in Washington, DC. Two femora and a partial skull were collected from the same locality as the holotype that was deposited by Ira Cornwall in the Royal British Columbia Provincial Museum in the 1920s. Though the partial skull is missing from the collection, the femora remain. They are small and lack epiphyses, possibly from breakage or immaturity. Muscle scars suggest that adductors, extensors and lateral rotators were strongly developed, indicating that their posture was of the normal mammalian upright nature. The sectioned end of USNM 11076 permits inspection of characteristics of the medullary canal and cortical.

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