LYOn] the hares AXD THEUi ALLIES 429 



The zygoma is moderately heavy, its posterior free extremity 

 moderately long', its antero-inferior angle slightl}' enlarged hut con- • 

 siderahly flared outward. The fossa, which is found usually in the 

 Leporidie on the anterior surface of the antero-inferior angle, is lack- 

 ing in Peufalagiis as it also is in Liuinolagns. The foot-like ex- 

 tremity of the zygomatic process is large. 



The audital bullae are very small, being even more reduced in size 

 than they are in Proiwlagiis. The external auditory meatus does 

 not have the form of a rounded tube, but is an oval ring of bone 

 closely applied to the side of the skull, just above and slightly behind 

 the audital bulla. The paramastoid process of the exoccipital, which 

 is in relation with the audital bulla posteriorly, is very large and 

 heavy, and projects below the lowest point of the bulla about six 

 millimeters. In all the other rabbits at hand, the paramastoid process 

 projects not more than one or two millimeters below the bulla. 



The sides of the maxilla are scarcely at all fenestrated, being 

 pierced by a few small foramina only. The infraorbital foramen is 

 large and distinct. 



The premaxillae are relatively shorter than in the other genera and 

 their nasal processes do not extend so far caudad. 



The mandible of Pciitalagns shows an exaggeration of the condi- 

 tion found in Liuinolagns. The angular process is large and rounded, 

 extends high up on the ascending ranms, which is relatively thick. 

 The condyle has a long antero-posterior dimension. The notch be- 

 tween the condyle and the angular process is very short and shallow. 



Teeth (pi. xci, 7; fig. 44, 24).— Peufalagiis differs from all 

 the other known genera of the Leporidre in lacking the third u])per 

 molar. 



The upper incisors are large and heavy, each with a broad sulcus 

 on its anterior face, not filled with cement. 



The first upper molariform tooth has the three usual reentrant 

 angles, of which the middle and largest one is very deep and has its 

 sides distinctly crenated. The second upper molariform tooth is the 

 largest of the maxillary teeth ; the third, fourth, and fifth are nearly 

 subequal in size. The reentrant angles on all the teeth are well 

 marked and extend almost completely across the tooth. The sides 

 of these angles are almost in contact throughout their whole extent 

 and more distinctly crenated than they are in the rest of the Leporidae. 



The first lower m.olariform tooth is very long. It is divided into 

 two portions, a narrower, longer, anterior one, and a broader, shorter, 

 posterior one. by two well-marked reentrant angles, one from the 

 external and the other from the internal fac.\ The anterior portion 



