﻿SUPPLEMENT (N°. II) 



TO THE 



MONOGRAPH 



ON THE 



IGUANODON. 



Dentition of the Upper and Lower Jaws (Tab. VII). 



In the year 1858 a considerable part of the skeleton of an Iguanodon was dis- 

 covered in the Lower Green-sand formation at Black Gang Chine, Isle of Wight. 



The workmen disposed of various parts of it, as opportunities offered; 

 and before steps could be taken to secure the whole for the British Museum, 

 portions of jaws and teeth had passed into the hands of private collectors. From 

 the best account of the discovery that I could collect, it appeared that the entire 

 cranium, somewhat dislocated, had been brought to light by the quarrymen ; but 

 the bones were in a peculiarly fragile, crumbly state, and only the firmer parts of 

 the jaws, lodging the teeth, were secured, and these portions in fragments. Some 

 of them, of both upper and lower jaws, are now in the British Museum ; and 

 learning that other portions had been acquired by George Bobbins, Esq., F.G.S., 

 of Castle, near Bath, I addressed a letter to that gentleman, who very kindly 

 brought his specimens to London, and liberally placed them in my hands for 

 description. 



The largest fragment fitted on to another portion of the jaw in the British 

 Museum, adding to its value as an illustration of the most interesting of the hard 

 parts of the Iguanodon. It consisted of a fragment of the left upper jaw, with 

 three teeth ; there were also three fragments of the left ramus of the lower jaw, 

 with one or more teeth in each. 



The germs of the new teeth are developed, in all Saurians, as is well known, 

 on the inner or mesial side of the base of the old teeth.* One of the teeth in the 

 portion of the upper jaw (Tab. VII, figs. 1, 2, and 3, m ) has its summit obliquely 



* Of this character Professor Melville ahly availed himself in determining the upper and lower teeth ol 

 the Iguanodon, in the joint memoir, by Dr. Mantell and himself, in the ' Philosophical Transactions,' 

 for 1848. 



