i6 



maqnum oa the median line of the occipital is an acute angular ridge. 



The foramen infraorbitale anterius opens above the posterior part 

 of the fourth premolar aud the anterior part of the first molar.. The 

 palatal notch is V-shaped and extends forward as far as the posterior 

 part of the second true molar. 



The third incisor is a small tooth in comparison with the canine 

 which is large, robust, and oval in section. The second premolar is 

 <iuite large being about four-fifths as long autero-posteriorly as pre- 

 molar 3. Premolar 3 is almost the same in form as that of P. occi- 

 dentalis, figured by Leidy. The exterior-anterior part of premolar 4 

 is slightly concave but back of that slightly convex. In the molars 

 the anterior external ridges or horns of the crescents extend some- 

 what forward, overlapping the tooth in front; but they do not extend 

 outward very prominently. The external ridges on the middle of the 

 crescents are mostly feelde. The first premolar is one-rooted. It is a 

 little longer than the third incisor. 



MEASUREMENTS. 



M. 



Total length of skull, about 380 



Length of part preserved 370 



Length of incisor 3 008 



?i eight of incisor 3 012 



Diastema between incisor 3 and canine 014 



Length of canine antero-posterior 015 



Width of canine Oil 



Canine to premolar 1 013 



r^ength of premolar 1 010 



Width of premolar 1 0082 



Premolar 1 to premolar 2 020 



Last three premolars 04f> 



Length of premolar 2 014 



Length of premolar 3 017 



Width of premolar 3 010 



Length of premolar 4 ; . . . .0161 



Width of premolar 4 016 



Length of molar series about .082 



Width between last incisors 023 



Width between canines 023 



Width l>etween first premolars 023 



Width between second premolars 026 



Width between fourth premolars 033 



Width between second molars, front 0426 



Width between third molars 058 



