Fig. 50. — Grinding surface of lower molar tooth of Mastodon sivalensis, 

 from the Lower Pliocene of the Siwalik Hills, India ; two-thirds nat. 

 size. (Table-case 23.) 



Fig. 51. — Grinding surface of upper molar tooth of i Elephas {Stcgodon) 

 clifti, from the Lower Pliocene of the Siwalik Hills, India ; one-half 

 nat. size. (Pier-case -30.) 



Fig. 52. — Grinding surface of incoinplito upper molar tooth of Elephas 

 planifrons, from the Lower Pliocene of the Siwalili Hills, India; two- 

 thirds nat. size. (Pier-case 34.) 



