392 Annals of the South African Museum. 



ridge which bounds one side of a shallow hollow lying above the 

 inner condyle. The outer condyle is slightly larger compared with 

 the inner than in the type of the species. 



The chief measurements are: 



Right humerus Left humerus 



Greatest length .... 219 mm. 223 mm. 



Breadth at distal end . . 75 78 



Width at narrowest part of shaft 29 ,, 29 ,, 



Width at top of deltoid crest . 80 70 



Greatest width of proximal end 94 ,, 87 

 From lower end of deltoid crest 



to furthest part of distal end 108 ,, 110 ,, 



Length of deltoid crest . . 55 ,, 55 ,, 



Thickness of head ... 16 ,, 17 



Max. thickness of proximal end 27 29 ,, 



Thickness at inner condyle . 25 ,, 24 ,, 



Thickness at outer condyle . 24 ,, 26 ,, 



Jtadius. Both radii are preserved, the left bone being crushed 

 proximally. The right is slightly shorter than the left, but each 

 lias the same general form. The right radius is 132 mm. long, the 

 left 135 mm., each being considerablv shorter than the ulna. 



O i/ 



The proximal articular surface is saddle-shaped. Below it the 

 bone rapidly thins, so that the whole bone is a straight cylindrical 

 shaft with expanded ends. The anterior edge is provided with a 

 rounded ridge. At the distal end the posterior-medial face has two 

 knobs, presumably for muscle articulation, a larger medial one and 

 a smaller posterior one. At the proximal end the medial groove for 

 the insertion of the humero-radialis muscle is very prominent. 



Breadth of proximal surface . . 36 mm. 



Thickness of proximal surface . . 25 ,, 



Breadth of distal end . . . 32 ,, 



Thickness at distal end . . . 23 ,, 



Minimum width of shaft . . . 16 ,, 



Ulna. Both ulnae are preserved, but the left is somewhat im- 

 perfect. The right gives the following measurements: 



Greatest length 152 mm. 



Width at proximal end . . . 52 ,, 

 Width at distal end . 40 



