344 



R. 8. Lull — Pleistocene Ground Sloth, 



alveoli, in so far as they are preserved, would seem to indicate 

 a dental series similar to that of the Brea skull in form and 

 proportions. 



Several other skull fragments are present which can not yet 



Fig. 3. 



Fig. 3. Jaws of Mylodon harlani, showing variation of tooth proportions. 

 A, Rancho La Brea specimen No. 10205. B, Rock Creek specimen No. 

 10267. C, Rock Creek specimen No. 10264. All from Yale collection. 

 D, cast of type, superior view. E, same from within. One-fourth nat. size. 



be given their precise location in the cranium. They are char- 

 acterized, however, by that remarkable development of can- 

 cellous tissues emphasized by Owen.* 



* Owen, R., Description of the skeleton of an extinct gigantic sloth, p. 23, 

 1842. 



