OF EXTINCT HABUUPBBOU8 QVADBUFBD. 181 



gated or rostrated extremity, containing the alveolar proces- 

 ses or sockets for two very remarkable tusks. The niperior 

 border of the Jaw, Gram the situation of the anterior teeth, 

 declines immediately, tapering towards the level of these 

 sockets, (hferiorly the outline of the jaw does ool so im- 

 mediately change, until opposite the anterior mental foramina, 

 whence it suddenly diminishes to the end. The rostrated 

 portion of the jaw. anterior to the front teeth, is three in- 

 ches and three-fourths long, and superiorly is regularly hol- 

 lowed or grooved as for tile reception of the tongue; this 

 hollow is two inches wide, quite smooth, and bounded on i ach 

 side by thin raised edges. 



The alveolar processes for the tusks arc contained within 

 the rostrated part of this jaw. and are Dearly an inch in di- 

 ameter at their outlet: the right one being liner, and the 

 left two inches in depth, gradually diverging from the centre, 

 and decreasing in width as they penetrate the bone. The 

 tusks belonging to these sockets are of a rerj striking appear- 

 ance, and that of the righl side,which is entire and well pre- 

 served, is four inches in length, three inches of which are 

 within the socket. The projecting external pari is covered 

 liya shining, hard, black enamel, and is smooth and round at 



its point; the other part appears to he a dark, grayish, I v 



matter, dry on the surface, yielding to the pressure of the 

 nail. The part of this tusk within the s,,rket is exactly ac- 

 commodated thereto, tapering to a small point. The exter- 

 nal projecting part has a peculiar spiral twist for about an 

 inch and a half from its anterior extremity, as will he readily 

 undent I by referring to the plate. [Plate Will. Fig, l \ 



In relation to the dentition of the animal, we find it pos- 

 sessed of sixteen teeth, eight of which (the two anterior 

 teeth on each side of both jaws) are deciduous or milk I. eth : 

 on the right side one of these has fallen out. while all the 

 remaining deciduous teeth are considerably worn, so as to 

 show that the enamel merely covers the external surface of 

 their crown-, as in the Mastodon, and does not penetrate 

 their substance as in the Elephant, fee. The p< rman< ni 



