430 



Annals of the South African Museum. 



the distal end is 175 mm., and that at the narrowest part of the 

 shaft is 75 mm. 



Humerus. The Rooi Nek specimen contains an almost complete 

 right humerus. Its proximal edge forms a somewhat higher bow 

 than is seen in the incomplete bone of the type from Thaba 'Nyama ; 

 but this latter shows signs of having been somewhat abraded before 

 its final entombment. Nevertheless, the proximal end is not so 

 strongly arched as in Gresslyosaurus, and the distal end differs con- 



Fig. 42. Melanorosaurus readi, Htn. 

 Right humerus inner view (3532). X . 



siderably from that genus. The lower end of the lateral process 

 lies nearly half-way down the bone. 



The distal and proximal articular surfaces are inclined to one 

 another at an angle of about 45. 



The distal end has been somewhat flattened, but it is broad and 

 thin. The lateral condyle is considerably smaller than the medial, 



