1884.] 517 [Cope 



Measurements. M. 



Axial length from occipital condyle to postfrontal pro- 

 cess 076 



Axial length from occipital condyle to palatonareal bor- 

 der 079 



Axial length from occipital condyle to end of last molar. .091 



Diameters of orbit 



vertical 031 



horizontal , 027 



Depth malar bone at middle of orbit 016 



" . zygomatic process posteriorly to glenoid face. . . . .028 



" skull (right angles to profile) at glenoid face 045 



orbit 046 



P-m. i 030 



Elevation of occiput from foramen magnum 044 



Width top of muzzle at preorbital fossae 040 



" at middle of supraorbital border 059 



" " postfrontal process .075 



" " malar below orbit. 110 



" " zygomatic process of squamosal 145 



" of occiput at condyles 066 



" " occipital condyles 039 



" " palate at palatonareal foramen 028 



" at M. ii .... 032 



" " " "canines 030 



Length of superior dental series with canines 088 



" " premolar series 047 



" " true molar series 036 



Diameters canine at base ( anteroposterior 089 



^ transverse 010 



Diameters P-m. iv. j anteroposterior 009 



I transverse 013 



Diameters M. ii. { anteroposterior 014 



<- transverse 018 



The typical specimen of this species was found by Charles H. Sternberg 

 on the North Fork of the John Day river. The horizon is probably some- 

 what different from that of the true John Day epoch. 



Eucrotaphtis sacksoni Leidy. 



Proceedings Academy Philadelphia, 1850, p. 92. Ancient Fauna of Ne- 

 braska, Smithsonian Contributions to Knowledge, 1852, p. 56, Plate VII, 

 figs. 4-6. Oreodon bullatus Leidy, Extinct Mamm., Dakota and Nebraska, 

 1869, p. 106. Report U. S. Geol. Survey, Terrs. 1873, 1, p. 318. Oreodon 

 oceidentalis Marsh, Amer. Journal Sci. Arts, 1873 (May), p. 409. Epor- 

 eodon oceidentalis Marsh, Loc. cit., 1875, p. 250. Eucrotaphus oceidentalis 

 Cope, Bulletin U. S. Geol. Survey Terrs., V, p. 59. 



Comparison of numbers of crania from the White river and John Day 



