436 ME. J. W. HULKB ON THE MAXILLA OF latTANODON. 



form, sculpture, and wear so characteristic of Tgiianodon, and they 

 illustrate the successive phases of its dentition, from the germ crown 

 which has not yet descended to the level of the dentary border, 

 through the fully protruded but unworn crown, to the almost final 

 stage where the crown is nearly worn away and the root is being 

 extruded from the alveolus. 



From the relatively slender and graceful form of this maxilla, I 

 am disposed to refer it to I. Mantelli, rather than to its more 

 massive contemporary /. hernissartensis. 



EXPLANATION OF PLATE XIV. 



Fig. 1. Inner, and Fig. 2. Outer view of a left maxilla of Iguanodon 

 from Cuckfield. (About nine tenths of the natural size.) 



DlSCUSSIOIf. 



Prof. Flower was glad to be able to announce that Mr. Willett 

 contemplated presenting the specimen to the British Museum. 

 Owing to the unworn character of some of the teeth and the peculiar 

 form of wearing of others, it forms a very instructive example of 

 the genus. 



Prof. Seeley said that, owing to the fragmentary character of speci- 

 mens, English fossil reptiles had been very carefully studied in detail, 

 and to this study Mr. Hulke had contributed many valuable additions. 

 He asked what were the differences in proportion between this jaw 

 and the typical Brussels skeleton. He remarked on the characters 

 presented by the palate. 



Mr. ToPLEY said the quarry at Cuckfield was not only that from 

 which Iguanodon was first obtained by Mantell, but that from which 

 almost all Mantell's Wealden specimens, recorded as from Tilgate 

 Forest, were collected. Many fossils were obtained from the same 

 quarry by William Smith. 



The Atjthoe said he had nothing to add to what he had already 

 stated. Mantell's species appeared to be slighter and more delicate 

 than /. hernissartensis. The palate was very imperfectly known. 



