On the Dinosaurs of the Stormbcnj, South Africa. 295 



Assuming these determinations to be correct the elements may be 

 described as follows : 



Radiale. A very small lenticular bone measuring 10 mm. in 

 length and about 4 mm. in greatest thickness. It has probably 

 been imbedded in cartilage, and lay in a concavity on the upper 

 side of the inner half of the large 1st distal carpale. 



Intermedium. A moderate-sized bone, which appears to have 

 lain on the proximal side of the outer fourth of the 1st carpale. 



Ulnare. This is roughly about the same size as the intermedium. 

 The outer and under side is concave as if to fit a part of the 

 cartilage of the 4th carpale. It appears to have articulated with 

 the 2nd and 3rd carpalia. 



1st carpale. This is a very large bone which distally articulates 

 with most of the end of the large 1st metacarpal and with half of the 

 proximal end of the 2nd carpale. Proximally it articulates with the 

 largely cartilaginous radiale and the intermedium. It seems, how- 

 ever, pretty certain that the lower half of the proximal end articu- 

 lated with the radius when the hand was flexed. The greatest 

 length of the bone is 56 mm., and the greatest thickness between 

 the dorsal and ventral sides about 35 mm. Between the proximal 

 and distal surfaces the greatest measurement is 20 mm. 



2nd carpale. This is a little less than half the size of the 1st 

 carpale. On the dorsal side it is narrow, and fits in between the 

 1st carpale and the end of the 2nd metacarpal, but on the palmar 

 surface it is broad and underlies a part of the metacarpal. 



3rd carpale.- This appears on the dorsal surface larger than the 

 2nd, but on the palmar surface rather smaller. On the ulnar and 

 proximal side there is a small concavity which probably articulated 

 with the large and mainly cartilaginous 4th carpale. 



4th carpale is a small flattened spheroidal bone about 12 mm. in 

 length and 7 mm. thick. It was probably imbedded in a large 

 amount of cartilage. 



The 1st metacarpal is a large bone, measuring in greatest length 

 64 mm. and about 54 mm. in width. The distal articular end is 

 divided into a large portion on the ulnar side and a small portion 

 on the radial. The 1st phalanx of the 1st digit has a very broad 

 proximal end measuring about 47 mm. Distally there is a bilobed 

 articulation for the large claw, which is so arranged that the claw 

 must have pointed downwards and towards the radial side. The 

 length of the bone is 63 mm. The 2nd phalanx is the huge claw of 

 the pollex. The proximal end measures 52 mm. in depth and about 

 28 mm. in greatest width. There is a very large bony process for 



