498 THE EOCENE PEBTOD. 



series. The incisors are subequal, and have flat crowns, projected obhquely 

 forwards. The crown of the canine is but Httle larger than that of the 

 third incisor. It is not canine-hke, but has a compressed cx'own, which is 

 inclined forwards, and has therefore an oblique base. The superior edge 

 consists of a long posterior and short anterior portions. The crowns of 

 the first and second premolars are compressed conic, convex in front, and 

 straight behind, the second with a minute heel. The root of the latter has 

 a figure 8 section; its two elements not being separated. The third pre- 

 molar is a large tooth, and the crown consists of an anterior compressed 

 obtuse lobe, and a wide heel, with a median cutting edge. There is a small 

 anterior basal lobe, and the interior side may be vertically grooved behind 

 it, as in various Artiodactyla, but not necessarily. The fourth premolar is 

 abruptly very much larger than the third, and is as long as the first true 

 molar, and a little naiTower anteriorly. In details of structure it is exactly 

 like the true molars. 



The internal extremities of the posterior branches of the Vs composing 

 the infei"ior molars rise into an acute cusp. The anterior branches of the 

 Vs, on the other hand, are curved backwards, partly closing the open 

 mouths of the Vs. The resulting pattern on wearing is a good deal like 

 that of the AnchitJierium. The anterior limb of the anterior V is a little 

 more produced in the fourth premolar. The last true molar is like the 



others. No cingula. * 



Measurements of inferior teeth. 



M. 



Length of dental series, including canine 055 



Length of true molar series 027 



Length of alveolus of canine 0025 



Height of crown of canine OOC 



Length of crown of third premolar 0058 



Diameters fourth premolar 5 «"t«^°P°«*'^"*'^ °^ 



( transverse 006 



erior 0092 



00G2 



Diameters second true premolar < '^^ ^ropos 



( transverse 



Several fragmentary crania are preserved. The best of these lacks the 

 muzzle and the zygomata. This one is remarkable for fullness of the frontal 

 region, the profile descending from it both anteriorly and posteriorly. The 

 brain-case is not narrowed, but the muzzle contracts rapidly. The orbits 

 are lai'ge and the malar bones prominent. Their posterior border is indi- 



