﻿64 PLEISTOCENE MAMMALIA. 



the living lions to equal in size the largest of the cave lions, because the conditions of their 

 existence are different. 



The difference in size between the largest cave lion on the one hand, and the average 

 living lion on the other, is not so great as between the largest Barbary lion and the 

 smallest Asiatic. We therefore consider that there is no ground for regarding the largest 

 and smallest individuals of Felis spelcsa as distinct species ; and we find every reason to 

 consider them both as undistinguishable from the lion, and as distinguishable in all respects 

 from the tiger, so far as relates to crania. 



The numbers used in the Pis. VI to XI, to denote the separate bones, are those given 

 by Professor Owen in his ' Homology of the Vertebrate Skeleton. ' The letters are as 

 follows : — 



a. Foramen lacerum posterius. 



b. Condylian fossa. 



c. Para-mastoid fossa. 



d. Para-mastoid tubercle. 



e. Splenial fossa. 

 /. Vidian foramen. 

 g. Foramen ovale. 

 h. Sectorial fossa. 

 i. Frontal process. 



j. Posterior palatine foramen. 

 k. Naso-palatine, or anterior palatine foramen. 

 /. Mastoidal process. 

 m. Meatus auditorius externus. 

 11. Outer surface of tympanic chamber. 

 o. Line of articulation of squamosal with mastoid. 

 p. Glenoid cavity. 

 q. Squamosal ridge. 



r. Squamosal pit (see squamosal, § 11, p. 3). 

 s. Sub-orbital process. 

 t. Supra-orbital process. 

 u. Palpebral tubercle. 

 v. Lachrymal foramen. 

 w. Naso-maxillary process. 



