82 THE BALTIMORE TOOTH. 



Another difference is in the number of the small intervening papillae ; two 

 of these existing between each of the ridges in the tooth under consideration, 

 and one generally in my specimens of Angustidens. We may remark, in 

 regard to the two mammilla? of the posterior talon in our tooth, that one 

 of them is smaller than the other. 

 opinions I described and also exhibited a cast of this tooth to the Geological 



upon, in 



America. Section of the American Association for the Advancement of Science, at their 

 meeting in Cambridge, in August, 1849. The description elicited ingenious 

 and valuable remarks from Professor Agassiz, Professor H. B. Eogers, and 

 Professor Gibbes, of South Carolina. Some gentlemen questioned the 

 probability of its having been actually found in the Western Hemisphere ; 

 believing it more probable that an insulated fossil should have accidentally 

 made its way from Europe, than that it should have been found in this 

 country ; and I had the same incredulity myself, when I first knew of it. 

 But a careful and repeated examination of all the facts connected with it, 

 and the opinion of the geologists in Philadelphia and Baltimore who had 

 seen the tooth and known its history, together with that of Mr. Charlesworth 



conospon- and Sir Charles Lyell, as well as a correspondence through Dr. Cohen with 



dence. • 



Dr. Ducatel [vide Appendix D), have given to my mind the conviction that 

 it is an American fossil of the narrow-toothed Mastodon, derived from the 

 miocene deposit, as is the Angustidens of Europe.* 



In 1850 I sent to Professor Owen, by Dr. Boott, a copy of the engraving 

 of this Baltimore tooth, and requested his opinion as to the species, to which 

 he replied in the following terms : — 



* This opinion receives some degree of support from the fragment of a tooth found on a wharf in the 

 city of Baltimore, and sent to the distinguished geologist Professor Gibbes, of South Carolina, which he 

 referred to the Mastodon Anarustidens. 



