112 Bulletin American Museum of Natural History. [Vol. X, 



absence of diastemata in the lower jaw. The canines of this 

 series are, moreover, broad and incisiform, being separated from 

 the first premolars by very short diastemata. In the same man- 

 ner the second premolars follow after a very short interval. In 



Fig. 8. 



Fig. g. 



Fig. 



Fig. 8. Fore and hind foot of Po'cbrotheriiim ivilsoni. 



Fig. g. Ulna and radius and humerus oi Poebrotheriuvi wilsoni. 



Fig. lo. Femur and tibia of Po'ebrotherium wilsoni. 



F. labiatiim, on the other hand, the lower canines and outer 

 incisors are almost in contact, the canines are subcaniniform in 

 shape, and there is a short diastema in front of, and a long dias- 

 tema behind, the first inferior premolar. The bones of the 

 limbs and other parts of the skeleton are, as far as can be deter- 

 mined, very much alike in the two species. As in F. labiatitm, 

 there is a considerable range in size in the various specimens 

 referred to this species. 



