450 THE WASATCH FAUNA. 



The section of the middle of the shaft of the radius is an oval placed 

 obliquel}" with the superior extremity truncate. This truncation narrows 

 and becomes the narrow convex internal edge proximally. Distally it ex- 

 pands into the inner face of the superior arched surface. The head is a 

 transverse parallelogrammic oval, with the internal extremity flared for- 

 wards at an angle of 45°, and narrowed. The middle line of the distal two- 

 fifths, below, is a prominent angular ridge, which disappears proximad to the 

 extremity. The latter is enlarged, and contracts to the carpal facets, espe- 

 cially from above and below. The lunar facet is wider antoroposteriorly 

 than the scaphoid, and has an indication of distinction from it. The 

 cuneiform surface of the ulna is placed at an open angle to them, and is 

 narrower than either. The shaft of the radius is curved, and the superior 



outline is convex. 



Meajiurements of anterior limb. 



II. 



Length of bumeniB 173 



( anteroposterior (greatest) 061 



Diameter of proximal end j ^^.j^pg^.^^gy < at bicipital groove 032 



^ < at lesser tuberosity 042 



Anteroposterior diameter of shaft at middle 027 



Width at epicondyles 044 



Width of condyle 035 



Anteroposterior diameter condyle ) "^t**""* ^7 "" 



' •' i internally 030 



Length of nlna 204 



Df pth at extremity of olecranon 026 



Depth at coronoid jirocess 03S 



Depth at middle of shaft 021 



Diameters of distal tuberosity \ vertical 015 



( transverse 022 



T.. . , , <. .< vertical 009 



Diameter of carpal facet I 



t transverse OIU 



Length of radius 14.t 



Diameters of head of radius J ^*'^*"''' "^^ 



c transverse 030 



Diameters at middle shaft | ''"^''"'' "^"^ 



( transverse Olo 



i^. . r 1- . 1 1 . ^ vertical 02.'> 



Diameters of distal enlargements 



( transverse 030 



Tu „ , r 1 r 4 < vertical (lunar) 013 



Diameters of carpal facets ^ ' 



( transverse 024 



The carpus is entirely preserved in my specimen. The general fea- 

 tures have already been described under the head of the genus Phenacodus. 

 The radial surface of the scaphoid and lunar is very convex in the antero- 

 posterior section, descending well on the ;nitcrior face, and leaving the ante- 



