WEALDEN IGTJANODONT AND OTHER DINOSAURS. 53 



latter as probably referable to the Scelidosauridae rather than to 

 the Iguanodontidae, in which its founder was inclined to place it. 

 If this be so, the question will arise whether Vectisaurus may not 

 be identical with Eegnosaurus, Mantell (Phil. Trans. 1848, p. 198), 

 founded upon a Scelidosaurian lower jaw from the Wealden of Cuck- 

 field, which Sir E.. Owen subsequently referred to Hylceosaurus. 



Pig. 3. — Outer aspect of a right Ilium (reversed) lyrovisionaUy 

 referred to Hylseosaurus. 



ci~.\ 





A section of the postacetabular process is shown. 



That Regnosaiirus is not, however, identical with Hylceosaurus is 

 almost certain if the detached teeth referred to the latter by Sir E. 

 Owen are correctly determined — and I do not know to what other 

 form they can belong — and the dimensions of the type mandible of 

 the former are such as to accord well with the vertebrae and ilium 

 of Vectisaurus. 



Before leaving Hylceosaurus^ I may mention that the imperfect 

 metatarsals provisionally referred by Sir E,. Owen to that genus, 

 but which Mr. Hulke pointed out could not well belong to it, are 

 referable to Megalosaurus ; since 1 jBnd that a similar specimen from 

 Hastings, acquired by the Museum from Mr. Dawson, not only 

 agrees in contour with the corresponding bone of the Stonesiield 

 Megalosaurus^ Ggured by Phillips, but was found in association with 

 a dorsal vertebra and a tibia undoubtedly belonging to that 

 genus. 



Sauropoda. — Turning to the Sauropoda, I may observe that 

 although I agree with Prof. Seeley in regarding this suborder as 

 closely allied to the Theropoda, yet I am not prepared to accept 

 the proposal made by him at the recent meeting of the British 

 Association to unite these two groups. Apart from the difference 

 in the pelvis, the wide divergence in the type of cranial structure 

 exhibited by Ceratosaurus and Diplodocus appears to me to be 

 decidedly of subordinal value, even if we should eventually find 

 forms connecting the two. While, indeed, the former agrees in the 

 position of the anterior nares with the Oruithopoda, the latter 

 approximates in this respect as closely to the Parasucliian Crocodilia ; 

 and there seems to me to be almost as much ground for uniting the 



