298 THE WASATCH AND BRIDGER FAUN^. 



posterior basal lobes, but the posterior face is concave. The third pre- 

 molar has a distinct though short posterior heel. The fourth premolar has 

 the posterior heel with a medan cutting edge ; there is a small anterior 

 basal lobe. There is no internal lobe, nor the i-udiment of it, as seen in 

 DicMphodeus ahsarokce. The first true molar is smaller than the second and 

 third, which ai-e nearly equal. The heels of all the true molars have a 

 raised border, which incloses a basin ; the inner wall is notched at its junc- 

 tion with the base of the principal cusp. The two inner cusps are of about 

 equal elevation, and are much less elevated than the external one. 



The enamel of all the teeth in both jaws is smooth. 



The symphysis mandibuli forms but a slight bevel of the general sur- 

 face, is not strongly sutural, and does not extend posterior to the second 

 premolai-. 



The ulna is rather robust. The section of the shaft is triangular, the 

 base upwards representing the section of a plane on which the radius rests. 

 This plane turns to a slope of 45° inwards near the distal part of the shaft, 

 where it is at first bounded by sharp superior and interior ridges. The infe- 

 rior edge is obtuse, and the inner and outer sides are concave, especially the 

 external. The distal extremity of the tibia is expanded and its malleolar 

 face is oblique, and not vertical, as in true carnivora. A compressed pro- 

 cess projects posteriorly in the plane of the posterior face, and is separated 

 from the posterointernal angular border by a shallow groove. No groove 

 or process on the external face, as is seen in Canis. 



Mea«uremetits. 



M. 



Length of palate 073 



Width of palate at last molar teeth 029 



Width of palate at first premolar teeth 0115 



Width of posterior niires 0117 



Width of nasal hones at middle 0116 



Width of frontal belweeu orhits 0385 



e anteroposterior 001)."> 



Diametersofhaseofcanine^j^^^^^g^ 006^, 



Length of premolar series 033 



Length of base of first premolar 0068 



- ., , ( fore and aft 008 



Diiimetcrs fonrth premolar^ „. 



( transverse Wt 



Length of trne molars 019 



,. ^ -^ , < fore and aft 008 



Diameter second trne molar i „ „ 



( transvM^rse UlUa 



