Owen decided that the fossils of polygonal plates of bony armour found at several locations were not from the Megatherium as Cuvier's description implied, but from a huge armadillo, as Darwin had briefly thought. Owen found a description of an earlier unnamed specimen which he named "Glyptodon clavipes" in 1839. Darwin's find from Punta Alta, a large surface about doubled over with toe bones still inside the folded armour, was identified as a slightly smaller "Glyptodont" named "Hoplophorus" by Peter Wilhelm Lund in the same year.