270 



Journal of Travel and Natural History 



will shew the acuteness of Mr Dawkins' diagnosis, and the vrai- 

 semblance of his interpretation. Fig. 4 shews the lower jaw of the 

 Deinotherium, and, looking at Mr Baines' sketch of the left side of 

 our elephant, it can scarcely be doubted that the large downward 

 and backward curving tusk, which we shall denominate the Deino- 

 theroid tusk, is the homologue of the tusk in the Deinotherium, 



and that it must have grown in the lower jaw. As Mr Dawkins 

 justly says, there is no room for such a tusk in addition to the 

 normal tusk in the pre-maxillary bones, and although it is not even 

 free from difficulty to imagine how it could find room in the lower 

 jaw, especially from want of length, the difficulty is undoubtedly 

 less there than in the upper jaw. 



Fig. 5- 



Figs- 5, 6, and 7 represent the under jaw of different species of 

 Mastodon (fig. 5, M. Ohioticus ; fig. 6, M. angustidens ; fig. 7, 

 M. longirostris), and we imagine still less difficulty will be felt in 

 accepting the small straight projecting teeth (which we shall 

 call the Mastodontoid tusks), seen between the two large tusks 

 in our elephant as the homologues of the projecting incisors in the 



