Fauna and Stratigraphy of the Stormberg Series. 363 



about 60 mm. The maximum width at the proximal end is 14 mm., 

 while the shaft is 4 mm. broad and 1-5 mm. thick as preserved. 

 The head is rounded, and there is no very prominent deltoid crest 

 although some distance below the head of the bone a slight crest 

 was present. The anterior face of the expanded portion is concave. 



The radius and ulna are both long, slender bones but slightly 

 expanded at their ends. The bone lying as the outer of the two on 

 the left-hand side of the body is slightly longer than the other, and 

 this I take to be the ulna. The left forearm is lying parallel to the 

 body with the elbow behind and the hand in front, bent almost at 

 an angle of 150 to the plane of the humerus. 



Radius. The radius has a length of 52 mm., while the middle 

 of the shaft has a greater diameter of 2'5 mm. The bone is com- 

 pressed and has its end expanded to a width of about 4 mm. Save 

 at the lower end, where it is slightly curved away from the ulna, it 

 is straight throughout its length. 



Ulna. The ulna is a slightly curved bone 54 mm. long, apparently 

 somewhat more slender than the radius, but with similar expanded 

 ends. Just below the surface for the articulation with the humerus 

 the radial border is markedly concave. 



Carpus. The carpus of the left side is partially displayed. Two 

 bones of the proximal row can be seen, one below the ulna and one 

 below the radius. These I regard respectively as the ulnare and 

 the radiale. 



The ulnare is an elongated bone with a narrow shaft and expanded 

 ends. In cross-section it is apparently oval. Its length is 10 mm., 

 the proximal width 4 mm., and the distal width 5 mm., while the 

 shaft of the bone has a width in its narrowest part of less than 

 2 mm. The proximal articular surface has a small outer convexity, 

 the remainder being hollowed out. The distal surface is cushion-shaped. 

 Attached to the lower end of the bone is a small bone, oval in 

 section as seen, 2 mm. high and 4 mm. broad, which may be the 

 fused 3rd, 4th, and 5th carpals. The radiale is a similar hour-glass 

 shaped bone 11-5 mm. long with its ends somewhat less expanded 

 than those of the ulnare. The narrowest part of the bone is 2 

 mm. wide. 



Metacarpus. Remains of all five metacarpals are seen. The third 

 and fourth articulate with the bone lying below the ulnare, but not 

 the fifth. Each metacarpal is an elongated bone with expanded ends. 

 The first is 9'7 mm. long, the second 10 mm., the third 9*5 mm. 

 and the fourth 8-3 mm., while the fifth is not fully displayed. 



Femur. The distal half of the femur is slightly curved and has 



