434 



Annals of the South African Museum. 



proximal end, a straight shaft, and a broadened distal end. The 

 tibial tuberosity is weathered away to a certain extent, but must 

 have been prominent. The proximal articular surface has a greatest 

 length of 193 mm., and a greatest width probably of about 100 mm. 

 The inner border does not stand much higher than the outer. The 

 inner border is convex with a shallow concavity at the middle. 

 Between the tibial tuberosity and the anterior and posterior ends of 



Fig. 46. Melanorosaurus readi, Htn. 

 Left tibia, outer view. X ^. 



the surface there is, in each case, a shallow concavity. The anterior 

 portion of the surface is higher than the posterior, and is not excess- 

 ively prolonged, but is bluntly rounded. 



Just below the middle of the bone, where it is most slender, the 

 shaft has an antero-posterior diameter of SO mm., and a lateral diameter 

 of (30 mm. The anterior surface is provided with a sharp keel in 

 its lower half which passes down to the anterior condyle. The post- 

 erior surface is rounded, the outer and inner surfaces flattened. 



At the distal end the anterior border has a length of 130 mm. 



