642 THE WASATCH AND REIDGER FAUX^. 



oblique to that of tlie rest of the head, extending upwards and forwards. 

 The carpal articular face is three times as long as wide, and is rather con- 

 tracted. The ulnar facet is rather large, and is sessile. The ulna is rather 

 slender, becoming more so distal ly. Its section is triangular, interrupted 

 on the middle of the shaft by an angular ridge, which extends from the 

 superior to the inferior borders on the outer side. The olecranon is com- 

 pressed, deep, and truncate. Its inferior border is a little thickened, and is 

 continuous with the external surface. The inner side is marked by a rather 

 elongate excavation, which fits the radius. The carpal facet is small and 

 subsemicircular in form. 



Measurements of ulna and radius. 



M. 



Length of ulna - 0116 



Length of olecranon 014 



f at end of olecranon 012 



1^ ii. j^ , I at head of radius 0085 



Depth of ulua S ^ j j, <• , ^ nn<- 



at middle of shaft 006 



I at carpal extremity 006 



Length of radius 093 



_. , /., J j7 J- < vertical . 0075 



Diameter of head of radius < 



( transverse 01.50 



Diameters of radius at middle < 



( trausverse 009 



_, . . ^ -i • , 1 , i < vertical 0100 



Diameters of distal enlargement I 



( tr.ansverse 0145 



Diameters of carpal surface J ^^'^ '"'' 



( transverse 0110 



Grooves for the extensor tendons are not seen on the superior side of 

 the distal extremity of the radius. The scaphoid part of the carpal surfjice 

 is very little recurved on the inferior face, and there is a mere trace of the 

 fossa that bounds this recurved surface on the outer side or below the lunar 

 facet in the higher Unffulata. 



In the carpus the scaphoid is the largest bone of tlie proximal row. 

 Its radial facet has a greater anteroposterior than transverse diameter, and 

 there is a short tuberosity behind it. Its trapezoid facet is a little larger 

 than that joined by the magnum. The radial facet of the lunar is a good 

 deal wider than deep. The posterior tuberosity is large and compressed, 

 but does not project as far posteriorly as that of the cuneiform. Its ante- 

 rior face is shorter than that of Triplojms cubitaUs, and has much the form 

 of that of Hyrachyus agrestis. The cuneiform has an obliquely descending 



