94 [August, 1846. 



Transverse fractures of the tusks of Hippopotamus, show fine con- 

 centric lines, as figured in British Fossil Mammalia, p. 402, fig. 160. 

 From the size, shape and slight degree of curvature of the Geor- 

 gian fossil, it may probably have belonged to the left side, lower 

 jaw, of the Mastodon giganteus. 



Genus Harlamus. 



No. 5. The middle part of the right ramus of the lower jaw of a 

 large Pachyderm, with the last three (or true) molars, part of the 

 premolar next in advance, and part of the socket of another premo- 

 lar. The crowns of all these teeth appear to have been worn down 

 by mastication to their base ; they present the proportions, and the 

 last molar, in a cast transmitted to me by my lamented friend, Dr. 

 Harlan, appears to retain the anterior of the two large transverse 

 ridges, which characterize the teeth of the genus Lopliiodon, Cuv.: 

 it likewise possesses the large posterior lobe or talon, which dis- 

 tinguishes this tooth in the Lophiodon from that of the Tapir. 

 The teeth of the fossil from Georgia a little exceed in size those of 

 the Lophiodon Isselanus (Grand Lophiodon d'hsel, Cuvier, " Os- 

 semens Fossiles," ed. 1822 , torn. 2. pt. 1, p. 184, pi. 3, fig. 3,) the 

 antero-posterior diameter of the last molar in that species being one 

 inch and eight lines, and in the present fossil one inch and ten 

 lines. But the depth of the jaw below the middle of the last molar 

 in the present fossil is three inches ; whilst that in the Lophiodon 

 Isselanus in the figure cited, is scarcely two inches ; and Cuvier 

 expressly states (p. 186,) that it surpasses in depth the correspond- 

 ing part of the jaws of the Lophiodon medius (pi. 3, fig. 1,) which 

 has molar teeth of the same size as in the Lophiodon Isselanus. 



The present fossil has been described and figured in " Silliman's 

 American Journal of Science," vol. 43, 1842, pi. 3, fig. 1, under 

 the name of Sus Americana ; Br. Harlan conceiving that from 

 its general appearance and number of the teeth this fragment 

 bore a close analogy with the same part in the Sus bahirussa, 

 Buff, acknowledging, however, that the Babyroussa " was a 

 much smaller animal." Besides the difference of size, the last 

 molar in the fossil has the anteror transverse ridge proportion- 

 ally larger, and the posterior lobe proportionally smaller than in 

 the Babyroussa, resembling the Lophiodon in the points in which 



