IGUANODONTID^]. 



199 



from that of /. bemissartensis by the greater vertical 

 depth of the preacetabular portion. 



Pig. 39. 



,'-" 



Iguanodon dawsoni. — The left side of the pelvis ; from the Wadhurst Clay of 

 Hastings. About T ] T . H, ilium ; Is, ischium ; P, pubis ; a, obturator 

 process. The descending part of the pubis is conjectural. 



R. 811. The imperfect centra of the sacrum and the associated 

 (Fig.) ischia ; from Hastings, and apparently associated with the 

 vertebrae "No. E. 640. There are five sacral vertebrae 

 anchylosed together, which have flattened haemal surfaces. 

 The left ischium, which has been described by the writer, 

 op. cit. p. 50, is represented in fig. 39 ; its total length is 

 0,870 (36-5 inches). Apart from the evidence of the 

 vertebrae, the fact that the ischium agrees in relative size 

 with the type ilium, and comes from the same horizon, 

 leaves little doubt as to its specific identity. The resem- 

 blance of these bones to the ischia of Camptosaurus and 

 Hypsilopliodon renders it probable that the pubis was of 

 the elongated type of these genera. 



It. 811 a. The imperfect right pubis, apparently associated with the 



