THE BALTIMORE TOOTH. 83 



"So far as I can judge from a figure which does not give a direct Professor 



Owen's 



side-view, or a direct view of the grinding surface, it appears to me to be opinion. 

 identical with that of the penultimate molar of the Mastodon Angustidens 

 given in M. De Blainville's great work. ' Osteographie des Ongulogrades,' 

 1 a. Elephas,' Plate XY. Fig. o, d." 



In 1851 I had an opportunity of delivering to him the cast furnished 

 me by Dr. "Wilson, of Philadelphia, and of conversing with him on the 

 subject, though very briefly. Not having had time to make a satisfactory 

 examination, he did not express any further opinion as to the specific 

 character. He did, however, say very decidedly, that the solitary existence 

 of the fossil in North America could not be taken as a fact adverse to 

 future discoveries of the same species. 



This fossil was, as we have already seen, judged by Mr. Charlesworth Distinct 



from 



to belong to the species Longirostris of Kaup. It has, in fact, .the form of m. Longi- 

 many Longirostris teeth ; the principal divisions are very similar ; the 

 mammillary eminences resemble those of the Angustidens and Longirostris, 

 being rounded and conical ; the union of the mammillae forms lobes as in 

 Longirostris, and not ridges as in Mastodon Giganteus ; the number of 

 lobes agrees with Mastodon Longirostris, if we consider the broken anterior 

 extremity to have been a lobe. Thus far we have reason to set it down as 

 Longirostris. On a careful comparison, however, I can find no one of the 

 Longirostris specimens, which has precisely the same divisions of the crown- 

 surface ; the clefts on the circumference of the tooth are deeper than in 

 Mastodon Longirostris, extending even through the cingulum; and at the 

 extremity of these clefts lies a set of small buttresses of a pyramidal form, 

 about half an inch long, not existing in the Mastodon Longirostris, and 

 veiy different from the interlobular eminences which we have called papillae. 



rostns. 



