OF EXTINCT MAMMII I.UOUS QUADRUPEDS. 483 



elongated at its anterior part, and hollowed out superiorly, 

 while on each side of the symphisis menti there is a canal 

 extending obliquely upwards through the bone, the right 

 one contains the root of a tusk, which occupies the whole 

 socket, and projects slightly on the inner side being 1.85 in 

 diameter. This right portion of the Lower jaw la two feel 

 four inches long, measured along its base, and weighs forty 

 pounds*. 



Every view taken of this animal strongly reminds us ol 

 its resemblance to the gigantic Mastodon; and hut for the 

 singular difference of organization presented by the lower 

 jaw and its tusks, we could not avoid concluding we had ob- 

 tained a young animal of that species. We have made dili- 

 gent examination of the different perfect lower jaws of the 

 Mastodon preserved in the cabin ts of the Philadelphia and 

 Baltimore Museums, the cabinet of the New York Lyceum, 

 8cc. to discover whether any trace of this structure could be 

 found, or had possibly been overlooked by previous observers 



These researches ended in a conviction thai nothing like 

 this construction pertained to the Mastodon, whose lowei 

 jaw ends in a distinctly decurved extremity, simply suited to 

 give attachment to the muscles of a lip; as is evidenl on re- 

 ferring to a specimen or to any authentic engraving. We 

 are therefore under the necessity of regarding it as a nnr. but 

 closely allied genus to the Mastodon; and propose for it the 

 following name and characters: — 



* The lower jaw bone of the Mastodon is two feet ten inches long, and weight 

 sixty pounds; hence our animal, in the adult state, was of about the same sue. 



VOL. III. 6 <■ 



