328 Annals of the South African Museum. 



trochanter major. The femur of Propappus rogersi differs from that 

 of P. omocratus in being shorter and stouter; in having the head 

 more largely cartilaginous; in having the great trochanter more 

 directly continuous with the articular surface ; and in having the 

 outer condyle relatively larger. 



The following is a comparison of the measurements of the femur 



in the two species : 



Propappus Propappus 

 omocratus. rogersi. 



Length of femur 335 290 



Width of head 75 75 



Length of head 117 112 



Width of shaft at narrowest part 60 60 



Width of distal end of the bone 137 147 



Tibia and Fibula. 



The right tibia and fibula are both in beautiful preservation. The 

 tibia resembles considerably that of Propappus omocratus, but differs 

 in a few points. The proximal articular end had probably a con- 

 siderable pad of cartilage. As preserved it is a large flattened 

 surface rising up to a prominent boss in the middle. It measures 

 112 mm. by 77 mm. as against 110 mm. by 85 mm. in Propappu* 

 omocratus. The distal articular surface is kidney-shaped and 

 measures 94 mm. by 55 mm., as against 90 mm. by 60 mm. in 

 Propappus omocratus. The total length of the bone is 177 mm. : 

 in P. omocratus it measures 200 mm. 



The fibula is the most perfect Pareiasaurian fibula known. It is a 

 slightly curved bone, with a slender shaft and dilated at each end. 

 The proximal end is expanded and flattened antero-posteriorly and 

 articulates on a distinct facet on the outer condyle of the femur. 

 The distal end is flattened in the opposite direction to the upper and 

 has a large convex articulation for the outer side of the proximal 

 tarsal bone. The total length of the bone is 206 mm. The proximal 

 end measures 63 mm. by 36 mm., and the distal end 68 mm. by 

 42 mm. The shaft is 27 mm. in diameter. 



Proximal Tarsal Bone. 



The proximal tarsal bone, which certainly represents the conjoined 

 tibiale and fibulare with possibly the intermedium, is of the well- 

 known Pareiasaurian type. 



