39 



The proximal end of the ulna (of median breadth anteri- 

 orly) narrows into a prominent ridge behind. This gives a 

 trihedral character to the shaft. This is persistent, but is 

 less marked as the fore-and-aft diameter decreases. The 

 remaining features of note are a high tuberous olecranon 

 expanding behind ; a shallow sigmoid, divided by a deep fossa 

 into two long divergent articular faces ; a trihedral shaft 

 tapering slightly, but distinct from the radius ; a narrow dis- 

 tal extremity, with a small irregular face for the cuneiform. 



The radius has a rather short shaft, curved forwards, ex- 

 panding below, and placed immediately in front of the ulna. 

 A strong ridge runs from the external tuberosity up the pos- 

 terior face of the shaft, disappearing two inches from the 

 top. The proximal end, fitting against the ulna by two small 

 faces, forms the greater part of the elbow-joint, a strong 

 median ridge dividing the proximal face into two subequal 

 surfaces with well-raised borders. The distal end of the 

 shaft is rugose, and more prominent than the proximal. It 

 has an oblong transverse face, which is slightly concave fore 

 and aft. The position of the radius, immediately in front of 

 the ulna, and its manner of articulation, remove any possibil- 

 ity of rotation, a feature in strong contrast with what we 

 should expect from the character of the head. 



Measurements of Ulna and Radius, 



M. 



Ulna, length, excluding olecranon • 224 



Ulna, length of olecranon . -080 



Ulna, transverse diameter, proximal surfaces -041 



Ulna, diameter of shaft at median line -038 



Ulna, fore-and-aft diameter, distal face "025 



Ulna, transverse diameter, distal face -017 



Radius, proximal face, transverse -048 



Radius, proximal lace, fore and aft -030 



Radius, median diameter, shaft -oig 



Radius, median diameter distal face, transverse -043 



Radius, median diameter distal face, fore and aft ,..,... -016 



The inanus is described from the third and fourth metatar- 

 sals, with three phalanges. The metatarsals are short, with a 

 wide, stout shaft, flat in front and slightly arched forwards 

 behind. The proximal ends unite and form a continuous 



