398 Annals of the ^o/ifh African Museum. 



slope of the bone. On the anterior face there is a short median 

 depression above the condyles. 



Maximum thickness at distal end . 79 mm. 



Thickness of lateral condyle . . 20 ,, 



Thickness of medial condyle . . 39 ,, 



Depth of lateral condyle . . . 73 ,, 



Depth of medial condyle . . . 63 ,, 



Tibia. The right and left tibiae are complete. The proximal portion 

 of the right has been flattened laterally, so that the head is con- 

 siderably narrower than that of the left. The outline of the head 

 of the bone differs in the two. The right tibia has a concavity both 

 before and behind the lateral tuberosity as in Massospondijlus carinatus; 

 the left tibia has the anterior concavity, but behind the tuberosity 

 the edge is regularly convex to the posterior point. It can thus be 

 seen that considerable care must be taken in distinguishing forms 

 by such features as the shape of the tibial head, which is variable 

 even in an individual. 



The general shape of the proximal end approximates closely to 

 that of M. caiinaitt* and needs no detailed description. As a whole 

 the bone is slender with the distal end but slightly expanded. The 

 anterior condyle lies above the posterior and looks both outwards 

 and downwards. The chief measurements are: 



Right Left 



Greatest length . . 300 mm. 298 mm. 



Length of proximal end . 100 ,, 87 ,, 



Width of proximal end . 50 ,, 61 ,, 



Minimum width of shaft . 24 ,, 28 ,, 



Minimum thickness of shaft 35 ,, 23 ,, 

 Length anterior border, 



distal end . . . 59 ,, 65 ,, 

 Length posterior border, 



distal end- . . . 45 ,, 41 ,, 



Max. thickness, distal end 42 ,, 37 ,, 



Fibula. The right fibula and most of the left are preserved. The 

 bone is slender, flattened laterally, slightly expanded at the end and 

 almost straight. The inner face at the proximal end is hollowed out 

 with a well-marked sharp crest bounding it anteriorly. In the mid- 

 part of the bone the medial face has a slight longitudinal ridge 

 anteriorly. At the distal end the anterior and posterior faces are 



