Douglass : Titanotheres from Uinta Deposits'. 309 



external ridges, passing downward from the base to the apex. There 

 is also a narrow postero-internal ledge. 



Unless the skull is more crushed laterally than it appears to be, 

 there is a sudden contraction posterior to the canine, so that the first 

 two premolars are much nearer to the median line of the palate than 

 are the canines. The diastema between the canine and PJ- is about 3 

 cm. in length. 



P-i is a simple oblong conical tooth, which has a small antero-inter- 

 nal depression, and a small ridge passes backward from the apex to the 

 posterior portion of the rudimentary keel. Pms. 2, 3 and 4 have 

 low cusps. The teeth increase nearly uniformly in width and size 

 from P- to the last molar. The two outer elements in each are well 

 defined and are sub-equal in size, although the anterior cusp is slightly 

 the larger. The internal cusp on P^- is small, oblong antero-poste- 

 riorly, and is placed far back. The internal cusp on P^ is much larger, 

 and is crescent-shaped. On P^ it is more nearly conical. There are 

 rudimentary cingula on the inner faces of the last three premolars. 

 The postero-internal cusp on 1VP- is represented by a low crescent- 

 shaped ridge. 



Measurements. 



Mm. 



Length of skull from anterior portion to glenoid articular surface 430 



Length of dental series 356 



Length of molar premolat series 247 



Length of premolar series 106 



Length of molar series 141 



Transverse diameter of I J- 16 



Antero-posterior diameter of I 1 18 



Transverse diameter of I- 2 - 16 



Antero-posterior diameter of 1^ 18 



Transverse diameter of I A 20 



Antero-posterior diameter of 1^ 22 



Transverse diameter of canine 22 



Antero-posterior diameter of canine 26 



Transverse diameter of Pi 12 



Antero-posterior diameter of F 1 22 



Transverse diameter of P^ , 21 



Antero-posterior diameter of P^ 28 



Transverse diameter of P :! 28 



Antero-posterior diameter of P-.., 27 



Transverse diameter of PA 33 



Antero-posterior diameter of PA 30 



Transverse diameter of M- 1 44 



Antero-posterior diameter of M 1 40 



