472 



Annals of the Carnegie Museum. 



remains in North Carolina, which appear to be identical with the 

 material from Montana described under the generic name Deino- 

 suchus. (See Ann. Carnegie Museum, Vol. VI, pp. 28-294.) It 

 is barely possible that this great tooth, recovered at Saltville, may 

 belong to this or an allied genus, which survived to a quite recent 

 geologic period. At all events the tooth represents an animal much 

 larger than any living species of the order now existing, at least in the 

 New World. W. J. Holland. 



Class MAMMALIA. 

 Order EDENTATA. 



Family MEGALONYCHID^. 



Genus Megalonyx. 



Megalonyx dissimilis Leidy (?). Cf. Leidy, Proc. Acad. Nat. Sci. 

 Philadelphia, Vol. VI, 1852, p. 117. 



The symphyseal portion of a pair of lower jaws (No. 3952 C. M. 

 Cat. Foss. Vert.) found at "Well No. 69" is provisionally referred to 

 M. dissimilis Leidy. The teeth of this specimen remaining in position 

 .are slightly larger, but have the same laterally compressed appearance 

 and outline in cross-section, as given in Fig. 8 of Plate XVI of Leidy's 

 "Extinct Sloth Tribe of North America," Smithsonian ContribiUions 

 .to Knowledge, June, 1855. While the teeth of the present specimen 

 appear to be as large as those of Megalonyx jeffersonii described in the 

 .same publication, the symphysis clearly has a smaller transverse 



Fig. 4. Megalonyx sp. Symphyseal portion of lower jaw, viewed from above and 



behind. X H- 

 Fig. 5. The same, with the back portion of jaw removed, showing the proximity 



of the roots of the teeth. X H- 



