INTRODUCTION. XI 



limb-bones No. 28701, p. 142, to Morosaurus : and if, as suggested 

 on p. 143, these specimens be referable to C. brevis, they would 

 serve to confirm the affinity between Cetiosaurus and Morosaurus. 



The calcanea mentioned on p. 225, and provisionally regarded as 

 Iguanodont, are recognized by Prof. Marsh as Sauropodous. 



Ornithopsis leeclsi (p. 15]), although stated by its describer to be 

 from the Eimeridge, is really from the Oxford Clay, and may there- 

 fore be distinct from 0. humerocristatus. 



The removal of the above-mentioned teeth from Hylceosaurus 

 likewise removes the objection of Owen's identification of Regno- 

 saurus with the former ; but JRegnosaurus may, so far as can be seen, 

 be equally well identical with the later Polacanthus, although appa- 

 rently too large to be the same as Vectisaurus. 



The name Omosaurus (p. 177) is preoccupied by Leidy (1856) ; 

 but since it is highly probable that the Owenian Omosaurus is not 

 generically separable from Stegosaurus (the small inner femoral 

 trochanter being a very insignificant point of difference), it seems 

 inadvisable to propose a new generic name for the European form. 



Iguanodon prestivichi (p. 196) has been provisionally referred by 

 the writer (Quart. Journ. Geol. Soc. vol. xlv. p. 47, 1889) to Campto- 

 saurus ; and the undetermined femur mentioned on p. 195, and the 

 mandibular ramus No. R. 180, p. 227. have been referred to the 

 same genus, as 0. valdensis. 



The writer is rather inclined to the opinion which was suggested 

 in Part L, that some of the portions of pectoral and pelvic girdles 

 entered under the head of Iguanodon I ernissartensis may indicate 

 another large species of Wealden Iguanodont. 



In the diagnosis of the Pythonomorpha (p. 261), Prof. Cope has 

 been followed ; and it has been omitted to notice that Prof. Marsh 

 has figured a sternum in one genus. 



In regard to particular specimens, the following emendations 

 may be made : — 



P. 150. No. R. 212 is the proximal extremity of a fibula. 



„ No. R. 97. In a paper recently read before the Geological 

 Society, it has been shown by Seeley that the describer 

 of the pelvis of Ornithopsis has mistaken the" ventral for 

 the dorsal surface, and that the specimen consequently 

 belongs to the left side. The other Sauropodous [id vie 

 bones arc in consequence referred to the opposite bide to 

 that to which they really belong. 



P. 152, No. 32498 is a radius. 



