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,’ pl. ii. 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.’ 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. 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 
