80 THE BALTIMORE TOOTH. 



One fact, quite remarkable, serves to prove the identity of the tooth 

 seen in Baltimore and that of Philadelphia. In his account of the tooth 



Fracture, to Dr. Ducatel, it was said by Dr. Tilden, that " it was broken by the men 

 engaged in digging, and the fragments could not be recovered." Now, the 

 tooth, as found in the Philadelphia Museum, has its anterior portion broken 

 off, in consequence of which there is a deficiency of nearly an inch of the 

 inferior surface of the anterior extremity, and of perhaps a quarter of an 

 inch of its superior face. This fracture is not represented in the engraving, 

 because the inferior face of the anterior extremity is not shown. The 

 fracture is oblique, and does not involve a considerable portion of the 

 tooth. 



a solitary As there is no other instance of the discovery, in the United States, of 



Discovery. 



any tooth or any other bone of the narrow-toothed group, and it is therefore 

 the only relic which can serve to establish the fact of the existence of the 

 remains of this species in this country, I have thought it proper to go into 

 details of its history, and also to give a description and representation of it. 

 (Plate XXVI.) 

 Descrip- This tooth is of a dark color, silicified and moderately heavy. It is 



narrower in proportion to its length than any of the teeth of the Mastodon 

 Giganteus, and resembles in this respect the teeth of the Mastodon Angusti- 

 dens and Tapiroides, as described by Cuvier, De Blainville, Owen, and Kaup. 

 In length it is five inches and a half, and its greatest breadth is two inches 

 and a half. Its superior face is divided by a longitudinal furrow, as it 

 usually is in Mastodon teeth, and by three transverse furrows. It has two 

 talons, the anterior of which is worn and broken ; the posterior, very perfect 

 and prominent. Each of the ridges and the posterior talon are divided into 

 two principal mammillary eminences, which are very distinct in the fourth 



tion. 



