DINOS.M'KIA. 



207 



scapula is remarkably long and slender, while the coracoid is small .m<l 

 rounded, notched or pierced by a foramen at its articular border. A pair 

 of almost triangular bones seem to represent postero-lateral ossifications 

 in the sternum, though this determination is uncertain. The humerus is 

 a little curved, with a prominent radial crest; both the radius and ulna 



FIG. 126. 



Iguanodon bernissartemis ; skull from the left lateral aspect, showing preden- 

 {afy^bone of mandible, one-eighth nat. size. Wealden; Bernissart, Bel- 

 gium. (After Dollo.) 



FIG. 127. 



Iguanodon mantelli ; four unworn lower teeth in fragment of jaw, inner aspect, 

 one-half nat. size. Wealden; Sussex. (After Owen.) 



are robust ; and the carpus is ossified, though its elements have not yet 

 been definitely determined. There are five digits in the manus, the first 

 reduced to a mere " spur " consisting of one pointed phalange, the others 

 having the phalangeal formula 3, 3, 3, 4. The second, third, and fourth 

 digits exhibit long metacarpals, and the two first are tipped with hoof- 

 shaped unguals ; the fifth digit is borne by a much smaller metacarpal 

 and is comparatively feeble. In the pelvic arch the antero-posterior 



