292 



MINERALS AND GEOLOGY 



teeth and portions of the tusks of two extinct proboscidians : the 

 mammoth, an extinct elephant of the Asiatic type (probably Elephas 

 primigenius*), and the common mastodon (M. Ohioticus). 



Fia. 238. 

 Molar tooth of Elephas pt itmgenius. 



FIG. 239. 

 Molar tooth of Mastodon Oli.intii-n.-i. 



: * It has been proposed to subdivide the genus Elephas into two distinct genera : Euelephax, 

 for the Asiatic type, with narrow, linear tooth-bands, short ears, &c.; and Loxodon, for the 

 African type, with tooth-bands of lozenge-like form, large ears and other more or less diver- 

 gent characters ; but this subdivision is not generally adopted. E. primigenius, again, is sub- 

 divided by some authorities into several species or sub-species, as E. Jucksmi, E. Aineri- 

 canus, &c. 



