Contributions to South African Vertebrate Pakeontology. I. 191 



on the anterior and inner side, where it is rounded. The narrowest 

 part of the shaft is 45 ram. by 36 mm., and the total length of the 

 bone is 246 mm. 



The ulna is about the same length as the radius, but has the 

 proximal end very much more strongly developed, and the distal 

 end more feebly. The total length is 256 mm. The narrowest part 

 of the shaft is about 85 mm. from the distal end. Here it measures 

 50 mm. antero-posteriorly and 30 mm. transversely. From this 

 point the shaft gradually widens, but keeps moderately thin to about 

 60 mm. further up ; then it rapidly widens and thickens to the 

 proximal end of the bone. There is no distinct olecranon process, 

 but the end is of large size. Antero-posteriorly it measures 110 mm., 

 and transversely 109 mm. It is slightly concave in the centre, 

 but otherwise somewhat flat. The end is irregularly triangular, the 

 anterior corner being continuous with the anterior edge of the shaft. 

 The lower end measures 80 mm, by 58 mm. On the outer side of 

 the lower part there is a large roughened patch which may have 

 been for a ligament. 



Iliubi, Ischium, and Pubis. 



The three bones of the right side of the pelvis are in an almost 

 perfect state of preservation. They were found lying together, but 

 the pubis was considerably displaced. The greater part of the ilium 

 of the left side is also preserved. 



The ilium is so very like that of Belodon that had no other part of 

 the skeleton been known one would certainly have referred the 

 South African remains to that genus. The lower part forms an 

 enormous acetabulum, and gives articulations to the pubis and 

 ischium, and with them completely closes the cavity. The articular 

 surface for the pubis makes with that for the ischium an angle of 

 about 115°. The surface for the pubis is 110 mm. in length and 

 45 mm. at its greatest width. The surface of the ischium is 

 145 mm. in length and 55 mm. in breadth. The acetabular portion 

 of the ilium forms a large depression, which occupies about half of 

 the outer surface of the bone. It is bounded above by a very pro- 

 minent ridge of bone, which rises about 73 mm. above the depression 

 of the acetabulum, and about 40 mm. above the general level of the 

 upper part of the ilium. The ridge, which is nearly in the line 

 joining the anterior pubic portion and the posterior iliac crest, is 

 about 80 mm. in length, and its highest point is situated 150 mm. 

 from the lowest part of the ilium, and 105 mm. from the iliac crest. 



