Note on the Bones of the Hind-foot of the Iguanodon, discovered and exhibited by S. H. Beckles, F.G.S.

T he specimens† exhibited by Mr. S. H. Beckles, F.G.S., and discovered by him in the Wealden-bed, south-coast. Isle of Wight, consist of bones of apparently the same individual of a more than half-grown Iguanodon, including the metatarsals and phalanges of the left hind-foot. This foot includes three toes. To the inner (tibial) side of the innermost of the fully-developed metatarsals, there is attached a styliform rudiment of a more internal metatarsal: the distal end of this rudiment is broken off, but it gradually tapers to that end, and seems, like the splint-bones in the metatarsus of a horse, to have terminated in a point, and not to have supported a rudimental claw. The outer side of the outermost metatarsal shows no mark of any other bone, rudimental or otherwise, having been there attached. The co-articulating surfaces at the proximal ends of the metatarsals show them to have belonged , as their position in the matrix indicated, to the. same foot. The innermost supports a toe of three phalanges, the middle metatarsal one of four phalanges, the outermost one of five phalanges. Only the ungual phalanx of the middle toe is wanting : and that no other phalanx is absent from this toe is shown by the modification of the distal articular surface of the penultimate phalanx ; which, like that in the adjoining toes, is less concave transversely, or is more uniformly convex, than the distal trochlear surfaces of the more proximal phalanges. The modifications of the claw-phalanx of the