54 



Annals of the Carnegie Museum. 



The maxillary is deep and the palatine plate is located high, so as to 

 give to that region a great transverse convexity. There is a consider- 

 able diastema between the canine and the cheek-teeth. The frontals 

 are well elevated over the orbits as in the Titanotheres generally, but 

 whether or not there were nasal protuberances, or horn-cores, cannot 

 be determined from the specimen. The parietals are evenly rounded 

 and considerably inflated laterally due to the large brain-case. 

 There is no sagittal crest and the lambdoidal ridges are extremely 



Fig. I. Heterotitanops parvus Peterson. Right lateral view of skull. (Tjpe. 

 No. 2909.) X 5. 



faintly indicated. The occipital plate, though well outlined, is not 

 defined by such sharp angles as is usually the case in the Titanotheies. 

 This is no doubt due to the immature condition of the skull. The 

 great projection of the condyle back of the vertical plate of the occiput 

 is also no doubt a juvenile character. 



The under border of the lower jaw has not the fore-and-aft curvature 

 usually seen in very young specimens of other vertebrates. Judging 

 from the impression left by the specimen in the rock the ramus con- 

 tinued of a uniform depth from M-j to the symphysis. The latter is 

 apparently quite heavy. The vertical ramus is of well-proportioned 

 diameter antero-posteriorly. The coronoid process is broad, extends 

 well backward as well as upward, and has a broad and rather atten- 

 uated termination. 



As already stated both upper and lower incisors are wanting. 

 The upper canine is just protruding through the alveolar border. 

 Its crown is damaged, but it appears to possess the shape and pro- 



