84: THE BALTIMORE TOOTH. 



These buttresses are not distinctly shown in the drawing. As to the 

 interlobular papilla?, one in each cleft is larger than the other ; and these 

 are more numerous and more fully developed than in Mastodon Longiros- 

 tris ; the worn surfaces, both internal and external, present the trefoil form, 

 and also the fringed appearance of the worn enamel, more distinctly than 

 any Longirostris I have seen. 

 An Hum- After comparing this tooth carefully with M. Laurillard's description 



boldtian 



Tooth, of the Humboldtian and Andium teeth, and with their figures represented 

 by Cuvier and Dr. Falconer ; after comparing it also with the excellent 

 casts of Kaup's Longirostris, examining the Humboldtian teeth in the 

 British Museum, and many beautiful and noble specimens of the same 

 in the Paris collection, — we have come to the conclusion, that the tooth in 

 question approaches nearer to the Humboldtian than to any other known 

 tooth. The points of resemblance are in the form of the mammillae, in the 

 form and number of the papillae, in the similarity of the worn surfaces of 

 the cusps, i. e. in possessing the trefoil figure on the inner and outer cusps, 

 and in the fringed appearance of the trefoil border as seen distinctly in 

 Plate XXVI. 



It is true that no other specimens from the same animal have yet been 

 discovered; but this objection will lie to the first discovery of any other 

 fossil ; a marked illustration of which may be found in the latter part of 

 Mr. Charlesworth's letter, Appendix C. Another objection is, that the great 

 distance between the regions where the Baltimore tooth was found, and 

 those which were inhabited by the animal bearing the Humboldtian teeth, 

 renders it improbable that the latter should have strayed so far as the 

 middle regions of North America ; but a great number of similar cases may 

 be adduced to show that such occurrences are not unusual. We have, for 



