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Keywords from Image Description:
Horn of Iguanodon. The original thumb spike referred to as the 'Horn of the Iguanodon' by Gideon Mantell Oriignal caption by Owen Ungual phalanges of modified shape probably from the extreme toe outer or inner of the hind foot of the Iguanodon Figs and are of the specimen called 'Horn of the Iguanodon' in the Works and Catalogue