University of California Publications. 



[Geology 



inferior side of the basioccipital and basisphenoid in the lion, is 

 absent in this specimen, as it is in F. spelaea according to Daw- 

 kins and Sanford. 



The auditory bullat are much smaller than in either the lion 

 or the tiger, and are smaller than the bullae of any modern 

 feline known to the writer. The entotympanic portion is much 

 less inflated than in the lion. The ectotympanic region is much 

 flattened, and is quite distinctly set off from the entotympanic 

 portion. The anterior spine of the ectotympanic region extends 

 farther forward than the anterior extension of the entotympanic 

 portion, and reaches forward over the base of the zygomatic arch 

 to a point a very short distance behind the middle of the glenoid 

 fossa. The space between the mastoid and postglenoid processes, 

 and opposite the external auditory meatus, is somewhat wider 

 than in the lion. 



The external auditory meatus is situated relatively far out 

 from the median line of the skull, the portion of the opening 

 nearest the median line being laterad of the inner side of the 

 stylomastoid foramen, as well as considerably farther out from 

 the median line than the inner end of the postglenoid process. 



The paroccipital process is relatively prominent, owing 

 largely to the reduction in size of the auditory bulla. 



The lower jaw in this species (tig. 2) is slightly heavier than 

 that of the Recent lion and tiger specimens available to the 

 writer, but is apparently not more massive than in some speci- 

 mens of the European spelaean form. The symphyseal region 

 is somewhat broader and more massive interiorly than in the 

 lion. This region is, however, covered in part with a rough 

 growth of hone which is more pronounced on the right ramus, 

 and may he due partly to age and partly to unusual conditions 

 existing only in this individual. In one of the specimens of 

 F. spelaea figured by Dawkins and Sanford 2 the symphysis is 

 nearly as heavy as in the specimen from Rancho La Brea. 



The inferior margin of the jaw is concave as in the tiger, 

 owing to the prominence of the symphyseal region and of the 

 angle. The most prominent portion of the middle region of the 



- British Pleistocene Mammalia, pi. 1, fig. 1. 



