165 



of the Mastodon elephantoides, including four transverse plates in different 

 stages of abrasion, the mummillary summits being nearly entire in the 

 posterior one. On one side of the fractured tooth the plications of the 

 descending folds of enamel are shown, the other side displays the 

 general course of the dentinal tubes. 



From the tertiary formations of the Sub-Himalayan district, India. 



Presented by the Rev. E. Everest, F.G.S. 



675. A fragment of the right ramus of the lower jaw of the Mastodon 

 elephantoides. The posterior fractured surface exposes the pulp-cavity 

 of the molar tooth, which is become rilled with rhomboidal crystals of 

 spar or carbonate of lime. 



From the tertiary formations of the Sub-Himalayan district, India. 



Presented by the Rev. E. Everest, F.G.S. 



676. A plaster cast of a portion of an upper molar of the Mastodon elephan- 



toides : the grinding surface, which is six inches in length, exhibits five 

 ridges ; the three posterior of which are terminated by six small obtuse 

 mammillae in the same transverse line. 



From the tertiary deposits of the left bank of the Irawadi, Ava. 



Presented by the Geological Society of London. 



677- A plaster cast of an upper molar of a younger individual of the Mastodon 

 elephantoides ; the crown of which supports six transverse ridges, and a 

 posterior talon or tuberculate ridge. 



From the tertiary deposits of the left bank of the Irawadi, Ava. 



Presented by the Geological Society of London. 



678. A segment of the tusk of the Mastodon elephantoides. 



From the tertiary deposits of the Sub-Himalayan district, India. 



Presented by the Rev. E. Everest, F. G. S. 



679. The body of a lumbar vertebra of the Mastodon elephantoides. 



From the tertiary formations of the Sub-Himalayan district, India. 



Presented by the Rev. E. Everest, F.G.S. 



