358 University Geological Survey of Kansas. 



pit in front of it, probably the empty alveolus for the second 

 large tooth. Measurements of premaxilla are : 



Length of alveolar border 107 mm. 



Greatest transverse diameter 24 " 



Greatest depth (estimated) 36 " 



The mandible seems to be slightly larger than the one de- 

 scribed by Professor Cope. Only the posterior portion is pre- 

 served, showing the articular and a portion of the dentary, 

 including several teeth. The dentary is coarsely striated ex- 

 ternally and has a rather indistinct groove just below the alve- 

 olar border. The teeth are probably not much reduced toward 

 the coronoid process and their bases are partially hidden on the 

 outside, as in P. leptopsis. The last tooth is separated from the 

 coronoid by a long, thin crest of bone which is somewhat ele- 

 vated. The exact line of separation between the dentary and 

 articular cannot be traced, probably owing to the fact that the 

 outer portions of the bone are injured and broken away in some 

 places. The cotylus is large, deeply concave from before back- 

 ward, and convex laterally. On the external side posteriorly 

 there is a wall of bone projecting upward that forms a slight 

 groove with the external side of the cotylus and receives the 

 outer rim of the quadrate. Just above and in front of the 

 cotylus there is a shallow pit, which seems to be not so well 

 marked as in the specimen described by Professor Cope. The 

 angular is a small element, and does not enter into the forma- 

 tion of the cotylus, as in P. caninus. It is irregularly marked 

 and has the appearance of being partially anchylosed to the 

 articular. The posterior extremity shows a roughened surface,, 

 which is probably for muscular attachment. 



Length of ramus (estimated) 330 mm. 



Distance from cotylus to last posterior tooth 118 " 



Depth at coronoid angle ( estimated) 83 " 



Depth at cotylus 36 " 



The quadrate is a rather long bone, which is probably not 

 very greatly expanded above. The condyle is deeply concave 

 trans versally, with sharp edges both externally and internally. 

 The anterior portion is thin above the condyle, while the pos- 

 terior portion is much thickened and has a well-marked ridge 



