34: Annals of the Carnegie Museum. 



P T is close to the canine ; it is single-rooted, with a rather high, 

 but bluntly pointed crown and a heavy rounded cingulum on the in- 

 ternal base. P2 has an oblique position in the alveolar border j the 

 anterior root, which is the smallest, is very close to P T . Back of P2 

 are four roots still preserved in the jaw. The space between the car- 

 nassial tooth and P2 would indicate that these teeth were of consider- 

 able antero-posterior diameter. The carnassial tooth is very charac- 

 teristic. The paraconid is unusually small. The protoconid is large, 

 quite bluntly pointed, with a vertical ridge on the anterior and poste- 

 rior faces. The metaconid is entirely wanting. The heel-cusp is en- 

 tirely central in position and is obliquely rounded, with a prominent 

 anterior and a less prominent posterior vertical ridge. The entoconid 

 ridge is hardly noticeable. Judging from the specimen M f was of 

 considerable size. The mandible is broken off back of M§. 



2 



Fig. 6. 1. Crown view of teeth of undetermined canid. 2. External view of 

 right ramus of undetermined canid. \ nat. size. No. 1506. 



Measurements. 



mm. 



Length of inferior dentition from M r to and including the canine 97 



Length of premolar series 59 



Antero-posterior diameter of canine at base l S 



Transverse diameter of canine at base I2 



Antero-posterior diameter of P T ° 



Transverse diameter of P T 5 



Antero-posterior diameter of M T 2I 



Transverse diameter of M T IO 



The Harrison Beds. 

 This horizon has an exposed surface extending over large areas in 

 Sioux County, Nebraska, and also stretching across the State-line into 



