CYCLOPID1US 



247 



orbital bar being composed equally of frontal and malar. They are large and circular, looking 

 almost entirely outward and a little upward, and are elevated. The temporal ridges are well 

 marked but die out before reaching the supraorbital margin. They unite at the postorbital constric- 



101/7, TYPE 

 Y. P. M. 



Fig. 173. — Cyclopdius lullianus Thorpe. Skull and jaw. HT. Cat. No. 101 17 Y.P.M. 2/3 nat. size. (After 



Thorpe, 1921.) 



tion to form a long, narrow, and rather high sagittal crest. The supraoccipital crest just overhangs 

 the occipital condyles, the wings are transverse, and the exoccipitals are so much widened that from 

 the rear this skull is proportionately the flattest and widest of all the oreodonts known. 



ZO//7, TYPE 

 Y. P. M. 



J01I7, TYPE 

 Y. P. M. 



Figs. 174 and 175. — Cyclopdius lullianus Thorpe. HT. Cat. No. 10117 Y.P.M. 2/3 nat. size. Superior view of 

 skull, right half, and (at right) anterior of muzzle. (After Thorpe, 1921.) 



The brain case is relatively very small and narrow. The external auditory meatus is tubular, 

 its direction being mainly outward but somewhat upward and backward as well and sometimes open- 

 ing as far back as a plane through the occipital condyles. Its orifice is as high as the highest point 



