310 



Annals of the Carnegie Museum. 



Mm. 



Transverse diameter of M- 2 -. 53 



Anteroposterior diameter of M^ 55 



Transverse diameter of M- 3 - 56 



Antero-posterior diamerer of M 1 51 



Width of palate between canines ? 68 



Width of palate between first premolars 54 



Width of palate between last molars 83 



Dolichorhinus heterodon sp. nov. 

 (Plate XIII, Fig. 3.) 

 (No. 2340 Carnegie Museum Catalog of Vertebrate Fossils.) 

 From upper part of horizon "B" or lower part of horizon "C," 

 six or seven miles northeast of Well 2, Uinta Basin, Utah. 



The skull is long, narrow, and moderately high. The face is short 

 and the brain-case long. The free nasals are long, the posterior open- 

 ing of the anterior nares extending well backward toward the orbit. 

 The lower border of the nasals approach each other, but this is prob- 

 ably in part due to lateral crushing. The infraorbital foramen is 

 large. The infraorbital shelf is represented by a protuberance, which 



Fig. 6. Palatal View of Skull of D. heterodon Douglass. (I nat. size.) 



is thickened on the free outer surface. If there were horn-cores above 

 the orbit they were very small. The long brain-case was apparently 

 arched from before backward, the posterior descent to the crest of the 

 occiput being very steep, though this may be somewhat exaggerated 

 by crushing. The occipital condyles are very large. The median 

 portion of the occiput above them is convex while above this there is 

 a large concavity. The postglenoid processes are not excessively large. 

 The premolars are small, the last being very decidedly smaller than 

 the first molar. The first premolar is not preserved, but it was evi- 

 dently a simple tooth. In the last three premolars there is a lobe o 



