LYSOROPHUS, A PERMIAN URODELE. 



235 



anterior angulation or curvature near the proximal third, this 

 third being directed more obliquely backward. There are no 

 traces of abdominal ribs in the numerous specimens examined, 

 nor any of dermal plates, save in the case already spoken of, 

 plates evidently belonging with a small mandible near them of an 

 apparently different type from that of Lysorophus. 



The terminal part of the tail, which is preserved in one speci- 



FlG. 3. Lysorophus /ricarinatus, skull from below, enlarged five diameters. 

 pm, premaxilla; 711, maxilla ; sij, squamosal ; 0, otic fenestra ; oc, occipital condyle ; 

 pa, proatlas. 



men, ends rather gradually, tapering to a point. In the seven- 

 teen vertebrae of the series there are no ribs and no diapophyses, 

 or very rudimentary ones anteriorly ; and I can find no traces of 

 chevrons. Characteristic figures of the vertebrae and ribs will 

 be found in the cited papers of Case. 



That Lysorophus \s not a reptile requires no argument — the 



