1902.] Matthew, A Skull of Dinocyon from Texas. 133 



lemanensis of the Upper Oligocene, the premolars are more 

 reduced, the muzzle larger, the sagittal crest not so high, and 

 the brain-case fully as large in proportion (although, as the 

 skull is so much larger, one would expect to see a proportion- 

 ately smaller brain-case). The arches are heavier and the 

 jaw much deeper. In the outline sketch of the skull (Fig. 3) 

 the crushing of the specimen has been corrected, as nearly as 

 could be estimated. 



The cervical vertebrae are of the size of those of the polar 

 bear, but differ rather widely from both bears and modern 



Fig. 3. Outlines of skull restored X J. 



Canids, suggesting some of the more primitive Canid^, such 

 as DaphcBHUs. The atlas is not very perfectly preserved, and 

 does not show any very significant characters. The axis is 

 not unlike that of the bears, the spine ending posteriorly in 

 a short heavy process directed equally upward and backward. 

 The anterior prolongation of the spine as a thin high lamina, 

 carried far forward in the dogs and still further in the cats, 

 is much reduced, as it is in the Ursidae. The haemal surface 

 of the centrum bears a strong median ridge. The remaining 

 cervicals bear spines of much greater height than in Canis or 

 Ursns, and of quite different form; they are fiat, slender at 



