ROOM III. SCAPULA OF THE IGUANODON. 285 



rom the glenoid facet by a deep notch for the passage of 

 r essels, instead of having a simple perforation as in the 

 lyleeosaurus. In both these reptiles, however, there is a 

 general analogy in the structure of the pectoral arch." 1 



" While examining the above Coracoid and Scapula I was 

 reminded of the fractured portion of two long flat bones in 

 ;he Maidstone specimen, (see Lign. 65,) which had hitherto 

 emained perfectly unintelligible ; and upon repairing to the 

 British Museum, the analogy between these mutilated bones 

 and the scapula was apparent, but it required much careful 

 jxamination and comparison before their identity could be 

 satisfactorily determined. The fragments in the Maidstone 

 fossil are, I think, unquestionably the remains of the left and 

 ight scapulae, which when perfect were of the type above 

 lescribed. 



' As the clavicles, coracoids, and scapulae, are now deter- 

 mined, the structure of the ^pectoral arch of the Iguanodon 

 may be regarded as established; and although the sternum 

 is at prjesent unknown, and the relative positions of the several 

 parts can only be conjectured, I have ventured to attempt 

 ,he restoration of this important part of the skeleton." 2 



HUMERUS OP THE IGUANODON. Wall-case C, lowest com- 

 partment on the right, (ante, p. 227.) Although numerous 

 femora, tibiae, and other bones of the hinder extremities were 

 early discovered by me in many localities in Sussex, and the 

 [sle of Wight, no certain remains of the fore-limbs, except the 

 metacarpals, were recognised until the summer of 1848. In 

 the " Report on British Fossil Reptiles," Professor Owen 3 sug- 



1 " Phil os. Trans." 1849, p. 278. 



2 See my Memoir communicated to the Koyal Society, and published 

 JL " Philos. Trans." 1849, p. 279, in which a restored figure is given of 

 rhe pectoral arch of the Iguanodon. 



3 " Humerus This important bone has not been hitherto satis- 

 'actorily determined ; it differs less from thf^kmur in form in Reptiles 

 :ftan in Mammalia. In the modern Crocodile the chief distinction in 

 ihe form of the humerus is the ridge at the l|per third of the bone ; in 

 Lizards this distinction is almost lost. If we find the femur of the 

 fguanodon distinguished from that of all other reptiles by the presence 

 of a peculiar process from the inner aide of the bone, there are not 

 wanting grounds to expect that the humerus may present a similar 

 cttaracter. As the reasons for suspecting that some of the large bones, 

 hitherto uniformly regarded as the femora, may be the humeri of the 

 Iguanodon, will best appear in the description of the femur, I shall now 



