160 THE WONDERS OF GEOLOGY. Lbct. II. 



todons which, from the structure of the teeth, fill up, as it 

 were, the interval that separates the mastodon from the 

 elephant ; one of these was in consequence named by Mr. 

 Clift, Mastodon elephantoides, {Lign. 26, fig. 2.) These 



1 2 



Lign. 26. — Fossil teeth of the elephant and mastodon. 



{One-sixth the diameter of the originals.) 



Fig. 1, Tooth of the Elephas primigenins, from Big-bone Lick. 

 2. Tooth of the Mastodon elephantoides, from near Ava. 



teeth present very peculiar characters ; for while in their 

 general appearance they resemble those of the mastodons 

 already described, the crown of the tooth is deeply ridged, 

 and the dentine and enamel are invested with so large a 

 portion of cement, as to give the worn surface of the crown, 

 the aspect of the molars of the true elephant. 



The specimens before us, consisting of teeth and bones 

 of mastodons, elephants, hippopotami, rhinoceroses, horses, 

 tapirs, antelopes, gavials, fresh-water turtles, &c. and 

 silicified wood, are part of an extensive collection formed 

 about twenty years since by Mr. Craufurd, on his mission 

 to Ava. In descending the river Irawaddi, his steam-boat, 

 owing to the shallowness of the water, ran aground between 

 Prome and Ava, about 20° north latitude, near some petro- 

 leum wells, where the bank of the river presented a cliff 



