178 MEMOIRS OF THE CARNEGIE MUSEUM 
Cervical region short. A strong sacrum and pelvis; tail moderately long and 
round. Fore and hind limbs of nearly equal length. Feet broad, ungual phalanges 
depressed, broad and powerful. The animal robust, and with proportions similar to 
Aplodontia and Cynomys. 
STENEOFIBER BARBOURI Peterson. 
From the Upper Miocene, Harrison (Demonelix) beds, Converse Co., Wyoming. 
This species and 8. gradatus are of very nearly the same size. The muzzle in 
both species is short and wide; the postorbital constriction moderate, perhaps some- 
what less constricted in S. barbowri. The brain-case in S. barbouri is moderately 
short. The temporal crests do not unite for some distance back of the postorbital 
constriction. The type specimen is crushed in this region. The injured parietals, 
however, show that the weakly developed temporal ridges were separated perhaps 
even farther back than in S. gradatus, and there may not have been a sagittal crest 
at all in S. barbowrt. The superior grinding series in this species is more parallel 
with the long axis of the skull than is the case in S. gradatws. ‘The width of the 
skull across the zygomatic processes of the squamosal is much greater (41 mm.) in 
S. barbouri than in S. gradatus (30 mm.). The latter measurement is taken from 
the illustration in the Tertiary Vertebrata, Pl. LXIIL., figs. 22 and 22a. The same 
figures show that the transverse diameter across the skull at p* is approximately 27 
mm., while that of the Wyoming specimen is only 30 mm., giving the latter skull 
a greatly different, wedge-shaped, appearance (PI. XVIL., fig. 9). The basi-cranial 
region back of the molars in S. barbowrt is shorter, the tympanic bulla and occipital 
condyles are larger, and the occiput is broader than in S. gradatus. The cheek 
teeth in the latter are decidedly less quadrate in outline, especially m+ and m®. 
The general contour of the skull of S. barbouri is similar to the one described as 
S. pansus by Matthew and Gidley. The latter skull, however, differs in the exca- 
vated basioccipital, the shorter palate and the higher and more vertically placed 
ascending ramus of the mandible. 
S. barbourt may be further characterized by the short neck, nearly equally long 
fore and hind limbs, broad feet, long and strong ungual phalanges as in S. fossor. 
In fact, the general make-up of the skeleton is similar to this latter species. It was, 
however, a smaller animal. 
