390 



PALAEONTOLOGY. 



The last lower molar of the Mast, angustidens from La 

 Eochetta di Tanaro* exhibits the same live principal trans- 

 verse ridges and the hinder one, as in the corresponding tooth 

 in the Eppelsheim Mastodon (fig. 143, m 3), and being the 



Fig. 143. 

 Dentition of old Mastodon longirostris. 



first of the series of narrow mastodontoid teeth to which 

 Cuvier applied the name angustidens, it may be regarded as 

 the type of that species. The characteristic premolar of the 

 Mast, angustidens, with a quadrate crown of two ridges, each 

 cleft into two tubercles (fig. 142, r p 3), is figured by Cuvier, in 

 Op. cit., pi. i., fig. 3, and again, in situ, with the last deciduous 

 molar (d 4) in a portion of the upper jaw of the Mastodon 

 angustidens from Dax (ib., pi. iii., fig. 2). This tooth {d 4, fig. 

 142) consists, in both the Dax and Eppelsheim specimens, of 

 three principal ridges and a posterior bituberculate talon. 



* Cuvier, Op. cit. Divers Mastodontes, pi. iv., fig. 1, top view, fig. 2, side 

 view. 



