LEPUS 501 



than external border ; posterior face with longitudinal concavity 

 barely indicated ; root as short as in Oryctolagus, but whole 

 course of tooth noticeably indicated on outer surface of bone. 

 Anterior upper premolar with lateral re-entrant angles on 

 .anterior margin variable in development, one or both occasionally 

 obsolete. Other maxillary teeth as in Oryctolagus, but posterior 

 border of re-entrant fold sometimes crenulate ; roots of maxillary 



Fig. 102b. 



etiropxus. Xat. size. 



teeth not extending so far into orbit as in Ori/dolagus and in 

 Lepus timidiis, the distance from crown of third premolar to 

 upper surface of its root capsule usually less than alveolar length 

 of tooth-row. Anterior lobe of anterior lower premolar usually 

 narrower than in Ori/ctolagns, but broader than in Lepus timidus ; 

 posterior section of this tooth as well as that of the succeeding 

 molariform teeth (including ik^) relatively larger than in 

 Oryctolagus. 



