326 Annals of the South African Museum. 



a saddle-shaped part for the ulna. The ulnar part passes round on 

 to the back of the bone to a much greater degree than in Pareia- 

 saurus, from which we may infer that Propappus could straighten its 

 limb more than Pareiasaurus. The width of the lower end of the 

 humerus is 175 mm. 



The total length of the humerus is 2G7 mm., as compared with 

 318 mm. in Propappus omocratus. 



Radius and Ulna. 



The radius is preserved in perfect condition, and the ulna 

 only lacks the distal end. 



The radius is a columnar bone with a moderately straight shaft 

 and dilated ends. The proximal end presents an oval surface 

 86 mm. x 60 mm. It is moderately deeply concave. The 

 narrowest part of the shaft measures 37 mm. x 26 mm. The 

 distal end is more massive than the proximal. The articular 

 surface measures 78 mm. by about 60 mm., and is somewhat 

 kidney-shaped. 



The ulna has a remarkably well-developed olecranon process, 

 which passes back for about 38 mm. behind the articular surface. 

 The articular surface is concavo-convex, measuring 70 mm. in length 

 and about the same in width. The large olecranon process when 

 viewed from behind is club-shaped, with a large number of shallow" 

 longitudinal markings on the surface. 



Pelvis. 



The pelvis is well preserved, the innominate of the right side 

 being nearly perfect, and much of the left side also present, though 

 badly weathered. Though in general type the pelvis is distinctly 

 Pareiasaurian, the differences from the pelvis of Pareiasaurus itself 

 are much more marked than in the case of the shoulder girdle. 



The ilium has its axis passing upwards and forwards from the 

 acetabulum. The crest is of considerable length and fairly straight. 

 Anteriorly it turns abruptly outwards for a distance about equal to 

 half of the antero-posterior portion. Owing to this outward turning 

 of the crest the anterior part of the ilium is triangular in section, 

 and there is a large flat surface looking forwards. Internally the 

 ilium is irregularly concave for the reception of the large first sacral 

 rib. The greatest length of the iliac crest is probably about 190 mm. 

 The transverse portion measures 100 mm. From the top of the 



