238 KANSAS UNIVERSITY QUARTERLY. 



oval in shape, and separated from the eustachian canal by a thin 

 plate of bone. Just back of the otic bulla is the round and rather 

 small jugular foramen. On the median side and lying near it is 

 the small posterior opening of the carotid canal. The precondyloid 

 foramen is located directly back of the latter and is similar in size 

 and shape. The postglenoid foramen enters at the antero-superior 

 angle of the external auditory meatus and forms a groove across the 

 entire anterior wall. The mandible is broader and stronger than 

 in D. felina, the symphysis and the flanges are deeper, and the coro- 

 noid process is shorter, narrower and less recurved. The flanges 

 form a sharp projecting ridge at the angle with the anterior border. 

 The anterior mental foramina are small and inconspicuous. The 

 condyle is long and narrow, the masseteric fossa comparatively 

 shallow and sloping at its borders. 



? — ? I — I ^— ^ I — I 



Dentition I -^ C , P mA_Am 



2—2, I — I 3—3 I — I 



The upper incisors together with the premaxillary border, are lost 

 entirely. The vipper canines are laterally compressed like those of 

 D. felina but somewhat broader and longer than the estimates 

 given of that type. They are two-edged, lenticular in cross section 

 and minutely denticulate on both borders as in D. cycIops, although 

 in this specimen the denticulation on the anterior border is almost 

 worn away. The upper conical premolar is two-rooted, broader 

 and more laterally compressed than in D. felina, but no trace of a 

 secondary cusp remains. A short diastema separates it from the 

 third premolar as well as from the canine. The anterior lobe of 

 the third premolar is wanting, but the posterior one is prominent 

 and is separated from the principal lobe by a transverse fissure 

 similar to that of the carnassials. The upper carnassial, as before 

 mentioned, is peculiar in its slender base as seen from above, its 

 concave outer border, the prominence of its anterior basilar pro- 

 cess, and the slenderness of the neck connecting with the internal 

 conical cusp. The heel is low and retreating, the principal cusp 

 short, and the transverse fissure open and marked. The crown of 

 the tubercular molar is lost; the roots remaining indicate a rather 

 strong tooth. 



The crowns of all the lower incisors are broken away, but the 

 position of the two roots remaining in one ramus and the one in 

 the other, points to the conclusion that there were but two incisors 

 on a side. The outer root is much stronger than the inner one. 

 The lower canine is almost round at the base, slender, somewhat 



