Pig. 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 Elephas (Stegodori) 

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

 nat. size. Pier-case 36.) 



Pig. 52. — Grinding surface of incomplete upper molar tooth of Elephas 

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

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



