170 Annals of the Carnegie Museum. 



the anterior edge by the upper canine. P^ overlaps inwardly Pi about 

 half its length. It also overlaps outwardly P^. 



The teeth might be called brachy-hypsodont. There is a pro- 

 nounced tendency toward hypsodonty. 



The Skull. — I cannot tell whether the premaxillaries were coossified 

 or not, but they are deeper above li than in Froinerycoc-ha'ri/s mon- 

 tixniis. The infraorbital foramen opens above the anterior portion of 

 pi. The forehead in front of the supraorbital foramina is concave. 

 This is due in part, but, I think, not entirely to crushing. The 

 nasals are long. The preorbital fossae are not large or deep. The 

 orbit is nearly circular. The zygomatic arch is moderately heavy, but 

 not so much so as in P. montainis. The anterior portion below the 

 orbit is not so high as in P. monfanus, iiiacfostegus, and leidyi, yet it 

 is higher than in Eiicrotapliiis (^Eporeodon ?) superbus. From its an- 

 terior part it expands posteriorly, reaching its maximum expansion a 

 little anterior to the postglenoid process. The outer border is moder- 

 ately thick and rounded. The posterior portion ascends less steeply 

 than in P. macrostegiis or P. superbus. The longitudinal portion is 

 quite broad and long. The lower border of the malar under the orbit 

 is longitudinally grooved. The bulla; were large, the paroccipital 

 processes small. The lower portion of the latter has three protuber- 

 ances on its surface, making it quite irregular. The upper portion 

 does not appear to have been much expanded laterally. 



Measurements. 



Mm. 



Length from front of canine to postglenoid process inclusive 185 



" of molar-premolar series 105 



" of premolar series 49 



" of molar series 5^ 



Hight of malar under orbit 24 



" of orbit 24 



Length of mandible to back of Mj 137 



" of lower molar premolar series 115 



" premolar series 55 



Depth of mandible mider Pj 30 



MIOCENE. 

 Flint Creek Beds. 

 All the specimens from these beds described below were found near 

 the village of New Chicago, in Granite County. 



