Fauna and Stratigraphy of the Stormberg Series. 373 



The bone was in contact with its fellow for a length of about 80 

 mm. At the bottom of the groove on the posterior surface the bone 

 is 17 mm. thick from back to front. At the distal end the maximum 

 thickness is '29 mm. 



Femur. The distal portion of a right femur is complete from the 

 trochanter quartus downwards. The distal end agrees closely with 

 that figured by von Huene in its general contours, its compression 

 sharply marking it off from Massospondylus carinatus. The length 

 from the bottom of the fourth trochanter to the distal end is 105 mm. 

 Both condyles are high ; at the lateral condyle the distal surface is 

 at its broadest. There is a deep, narrow groove between the condyles 

 on the posterior surface. The minimum breadth of the shaft is 

 24 mm. The length of the distal articular surface is 39 mm., its 

 breadth at the lateral condyle 34 mm., and at the medial condyle 

 29 mm. 



Tibia. The tibia is complete save for the proximal articular surface. 

 The length is 174 mm. The bone seems slightly crushed, so that 

 the medial edge of the proximal end is not very convex. The medial 

 condyle lies nearer the posterior end of the surface. Behind the 

 anterior point the lateral border is somewhat concave. The shaft 

 is flattened laterally and has a minimum thickness of 35 mrn., and 

 a minimum breadth of 11 mm. At the distal end the bone is broader 

 in front than behind, the breadths being 31 mm. and 17 mm. 

 respectively. The anterior condyle lies 13 mm. above the posterior. 



Discussing the relations of this species with European members 

 of the genus von Huene says Thecodontosaurns skirtopodus has some- 

 what shorter dorsal vertebrae than T. antiquus, the cross-section 

 being the same. The humerus is of similar size to T. antiquus, 

 but the processus lateralis reaches much deeper here than there. 

 A bone, which is doubtless the end of the ischiurn, agrees with a 

 similar bone in T. antiquus and differs considerably from T. polyzelus. 

 The distal end of the femur is smaller and thicker than in T. antiquus 

 and T. cylindrodon, and the condyles are higher than in T. polyzelus. 

 The length of the tibia agrees with that of T. MacGUlivrat/i- the 

 proximal end is tolerably small, the lower half of the shaft and 

 distal end thicker than in T. antiquus. The astragalus is as in 

 T. antiquus. Metatarsal IV corresponds best with T. polyzelus. 



Type. Portion of hind limb in British Museum. 



Locality. Barkly East Division, C.P. 



Horizon. Cave Santstone. 



