On the Skeleton of a New Pareiasaurian. 23 



distal end is bi-lobed, possesses two main, low ridges, and is 

 longitudinally striated. 



There is no trace of a clei thrum. 



HUMEEUS. 



The right humerus is almost complete, and well preserved, but 

 somewhat crushed, while portions of the distal and proximal ends of 

 the left humerus were found weathered out. 



The greatest length of the right bone is 345 mm. The bone is 

 greatly constricted in the middle, at its narrowest measuring 

 45 mm. x 40 mm. The shaft is rotated to a greater degree than in 

 Propappus rogersi, but less than in Pareiasaurus serridens, the angle 

 which the head makes with the distal end being about 45 much 

 the same as in Propappus omocratus (S.A.M. specimen). 



The proximal end measures 184 mm. in breadth, and is compara- 

 tively flat. The delto-pectoral ridge is well developed, but shows 

 none of the twisting so prominent in Propappus rogersi. The 

 articular surface is long and narrow, and there is a well-marked 

 ridge running on the outer surface of the bone from the anterior end 

 of the articular surface to the constricted shaft. 



The distal end differs both from that of Propappus omocratus and 

 from that of P. rogersi in being much narrower, and in having the 

 condyles much nearer together. The inner condyle appears to have 

 been crushed, and is rather incomplete, but it forms a prominent 

 narrow boss with a central ridge. The width across the distal end 

 is 140 mm. The large rounded prominence for the articulation of 

 the radius and ulna agrees in shape and position with that of 

 P. omocratus. There is a well-developed entepicondylar foramen. 



EADIUS AND ULNA. 



The right radius is perfect, and the proximal ends of both ulnae 

 are present. 



The radius consists of a straight columnar shaft with dilated ends, 

 its length being 188 mm. The proximal end has an oval concavity, 

 79 mm. by 52 mm., about 16 mm. deep, and must have been sup- 

 plied with a thick pad of cartilage. The inner end of the concavity 

 is slightly prolonged. The distal end is irregularly triangular in 

 shape with the front outer angle rounded. It measures 80 mm. by 

 55 mm., and altogether is more massive than the proximal expan- 

 sion. At its narrowest the shaft measures 38 mm. by 30 mm. 



The proximal part of the right ulna preserved measures 140 mm. 



