 He wrote home describing this and the large skull as "Megatherium" fossils, or perhaps "Megalonyx", and excitedly noted that the only specimens in Europe were locked away in the King's collection at Madrid.In the same layer he found a large surface of polygonal plates of bony armour.His immediate thought was that they came from an enormous armadillo like the small creatures common in the area, but from Cuvier's misleading description of the Madrid specimen and a recent newspaper report about a fossil found by Woodbine Parish, Darwin thought that the bony armour identified the fossil as "Megatherium".