with Descriptions of Neiv Forms. 175 



rotated inward, being placed at an angle of abont 45° 

 from the sagittal plane. It has both anterior and poste- 

 rior basal tubercles and posterior cnsp. P 3 is nearly 

 parallel to the sagittal plane, has a prominent posterior 

 cnsp bnt small basal tnbercles. P 4 is obliqne to the sagit- 

 tal plane, its metacone is deep and wide, and the deutero- 

 cone is small. M 1 is typical of the genns. M 2 is mnch 

 smaller than that of E. stenocephalus and bnt slightly 

 larger than that of E. crassidens. The infra-orbital fora- 

 men is above the extreme posterior edge of P 3 and is ver- 

 tically oval. 



This species differs from E. crassidens chiefly in 

 smaller size ; wider P 3 ; larger M 2 ; different outline of 

 superior dental series ; different incisor forms ; smaller 

 denterocone of P 4 ; more posterior position of infra-orbi- 

 tal foramen ; larger orbit ; more robust malar below orbit ; 

 and slightly more elongate face. 



Measurements of Holotype. 



mm. 



Length of skull, partly estimated 150 



Width of postorbital constriction 28 



Length of superior dentition 75 



Width of six incisors 25.5 



Diameter of canine, ant. -post. 11 mm. ; transverse 8.2 



Diameter of P 2 , ant.-post. 8.7 min. ; transverse 5 



Diameter of P 3 , ant.-post. 11.6 mm. ; transverse . 7 



Diameter of P 4 , ant.-post. 19.2 mm. ; transverse 11.6 



Diameter of M 1 , ant.-post. 10.1 mm. ; transverse 15.5 



Diameter of M 2 , ant.-post. 4 mm. ; transverse 5 



Tephrocyon rurestris (Condon). 



This genus and species is represented at Yale mainly 

 by superior and inferior teeth of several individuals, all 

 from the Mascall formation of the John Day Valley. 



Eeferences. 



Condon, T. 1902.- The two islands and what came of them. Portland, Ore. 

 Cope, E. D. 1879A. On some characters of the Miocene fauna of Oregon. 



Proe. Amer. Philos. Soc, 18, 63-78. 

 — 1879B. Second contribution to a knowledge of the Miocene fauna of 



Oregon. Ibid., 18, 370-376. 

 — 1879C. Observations on the faunae of the Miocene Tertiaries of Oregon. 



Bull. TL S. Geol. and Geog. Survey Terr., vol. 5, 55-69. 



Am. Jour. Sci. — Fifth Series, Vol. Ill, No. lo.— March, 1922. 

 13 



