48 



ME. K. LTDEKKEE ON A NEW 



odont character of this vertebra is self-apparent, and from the 

 comparatively slight degree of compression of the centrum compared 

 with that of some dorsals to be noticed below, and the circumstance 

 that all the other parts of the skeleton belong to the hinder region, 

 I think it probable that it should be regarded as coming from the 

 middle of the dorsal series. In its comparatively low arch, and the 

 Mgh position of the rib-facet, it differs from all the anterior and 



Pig. 1. — Left lateral aspect of a middle Dorsal Vertebra of 

 Iguanodon Dawsoni, from the Wadhurst Clay. (About -i- nat. size.) 



b. Facet for rib. 



^r.z. Prsezygapophysis. 



t]}. Base of transverse process. 

 2)t.2;. Postzj'gapophj^sis. 



middle dorsals of /. bernissartensis with which I have been able to 

 compare it, while its centrum is also less compressed, lower, and 

 more wedge-shaped. In its low arch and the position of the rib- 

 facet it resembles the vertebrae oi Sxj'henosiJondylus,h\\t the centrum 

 is relatively shorter, and other specimens probably belonging to the 

 same form show that the anterior dorsals had higher arches than in 

 Bplienospondylus. The dorsals of /. PrestivicJii described by Mr. Hulke 

 differ from those of J. bernissartensis and I. Mantelli by the smaller 



