330 



PALAEONTOLOGY. 



eminences, instead of the flat grinding surface observed in 

 the molars of the elephant. (Fig. 239.) In early life the 

 mastodon had two small, straight, tusks, which projected 

 from the lower jaw ; this circumstance led Grodman to pro- 

 pose the genus Tetracaulodon, for the remains of a young 

 mastodon ; as these lower defences are, however, deciduous, 

 and only characterise the immature animal, the genus must 

 be rejected. The palseontological gallery of the British 

 Museum contains a noble specimen of the Mastodon. This 

 genus included several species, two or three of which are well 

 ascertained : the M. giganteus is found in the sub-apennine 

 stage of North America, Europe, Asia, and New Holland ; 

 M.cifagustidens is found in the miocene stage of Eppelsheim 

 andiSansan ; JML. longirostris from the same stage in Eng- 



FIG. 241. Elephas Indicua 



land, France, and Germany. The other species have been 

 discovered in Europe, Asia, and America. A more accurate 

 anatomical investigation, however, must be made of the 



