288 PROBOSCIDIA. 



todon may with certainty have its place assigned to it in 

 the dental series, and in the jaws supporting them. 



I have not thought it necessary to multiply figures of 

 the molars of the Mastodon angustidens, which have been 

 at different times discovered in this country ; those select- 

 ed for illustration show the three well-marked grades of 

 size and complication of grinding surface, and will, I hope, 

 suffice, with the descriptions, to enable the collector of 

 fossils to identify subsequent dental remains of this rare 

 British extinct Mammal. The works of Cuvier and of 

 Dr. Kaup above cited, give admirable illustrations of all 

 the teeth of the Mastodon angustidens. 



The summits of the principal, or normal eminences of 

 the crown, are usually subdivided by shallow clefts into 

 smaller tubercles ; a character which is most conspicuous 

 in the incompletely formed small molars at the anterior 

 part of the series. Cuvier has shown this structure in 

 the young Mastodon's tooth from Orleans, figured in his 

 ' Divers Mastodontes, 1 pi. iii. fig. 6. Dr. Kaup has well 

 represented it in his tab. xx. fig. 3, tab. xxi. fig. 1. And 

 Mr. Lyell has given an admirable cut of a fourth lower 

 molar of the Mastodon angustidens, from the fluvio-marine 

 crag near Norwich, in the last edition (1841) of his 

 ' Elements of Geology. 1 I have now before me the germ 

 of a corresponding molar of the same species of Mastodon, 

 subsequently discovered by Mr. Robert Fitch in the same 

 stratum and locality. 



Captain Alexander has recorded his discovery of a frag- 

 ment of a young tooth of the Mastodon, in the crag at 

 Bramerton, in the third volume of the ' Geological Proceed- 

 ings. 1 This tooth belongs to the Mastodon angustidens, and 

 the crag is of that fluvio-marine origin which Mr. Lyell 

 has shown to belong to the older pliocene period. In the 



