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. 1 and 2, are of the specimen called 'Horn of the Iguanodon', in the Works and Catalogue of Dr. Mantell. From the Wealden, Sussex. In the British Museum
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{{Information |Description=The original thumb claw 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 Iguanodo