268 



BRITISH FOSSIL REPTILES. 



Scapula. 



Inches. Lines. 



Length of the bone 29 



Breadth across the middle of the shaft ....... 3 



Humerus. 



Length 19 



Breadth of proximal end .........GO 



Breadth of distal end . 4 



Ulna. 



Length 18 



Breadth of proximal end ......... 3 



Ilium. 



Length 30 



Breadth across the enlarged end . . . . . . . .10 



Extent of sacro-iliac articulation . 19 



Femur. 



Length 33 



TiUa. 



Length 31 



The detached teeth and bones of the Iguanodon successively discovered in the 

 Wealden strata of Sussex, and afterwards found associated together to the extent of 

 nearly half the skeleton of one and the same individual in the Green-sand quarries of 

 Mr. Bensted, offer not the least marvellous or significant evidences of the inhabitants 

 of the now temperate latitudes during the later secondary periods of the formation of 

 the earth's crust. 



With vertebrae flat or subconcave at their articular extremities, having, in the dorsal 

 region, lofty and expanded neural arches, and doubly articulated ribs, and characterised 

 in the sacral region by their unusual number and complication of structure ; with a 

 Lacertian pectoral arch, crocodilian proportions of the fore-limbs, and unusually 

 large bones of the hind limbs, excavated by large medullary cavities and adapted for 

 terrestrial progression, as well as for natation ; — -the Iguanodon was distinguished by 



