IGUANODONTID^. 



197 



writer in the * Quart. Journ. Geol. Soc.' vol. xliv. p. 47, 

 fig. 1 ; the figure being reproduced in the accompanying 

 woodcut. The length of the centrum is 0,120, the vertical 

 diameter of its anterior face 0,110, the transverse 0,118, 

 and the total height of the specimen 0,447. The position 

 of the rib-facet is like that in the vertebra of Spheno- 

 spondylus (fig. 47). 



Fig. 38. 



Iguanodon dawsoni. — Left lateral aspect of middle dorsa vertebra ; from the 

 Wadhurst Clay of Hastings. About \. b, rib-facet ; tp, transverse process ; 

 pr.z, and pt.z, pre- and postzygapopbyses. 



R. 798 a. A posterior dorsal or lumbar vertebra, associated with the 

 preceding. The posterior surface of the centrum is much 

 larger than the anterior, and is distinctly concave, while 

 there is a well-marked hrenial carina which is wanting in 



