402 Annals of the South African Museum. 



the remains described by him from St. Fort, Bethlehem, O.F.S. to 

 Massospondylus Irowni. The only possible comparison that can be 

 made is between the femora, and it is apparent that, not only is the 

 proximal end of the type of M. browni (i.e. Thecodontosaurus browni) 

 stouter than in van Hoepen's specimen but the trochanter quartus is 

 nearer the proximal end. Moreover, the type is a considerably smaller 

 animal, and has been assigned by von Huene, whose judgment cannot 

 lightly be set aside, to the genus Thecodontosaunts. There can be 

 no doubt that Dr. van Hoepen's species belongs to the genus Masso- 

 spondylus, and the question arises whether it is a specimen of M. 

 harriesi to which it closely approximates in size. 



Comparison can iirst be made with the almost complete specimen 

 of M. harriesi from Blikana. This shows that the humerus is almost 

 exactly the same shape, and very slightly smaller; the ulna differs 

 in that the Cape specimen has a slightly more slender shaft and has 

 a posterior prolongation at the proximal end, which may have been 

 worn off in van Hoepen's specimen; the radius of the former has 

 a more slender shaft, swelling somewhat more abruptly at the ends; 

 the scapula and coracoid are very similar, save that the distal end 

 of the St. Fort specimen is apparently slightly narrower, thus 

 coming closer to the type; the femur of the Blikana specimen is 

 more strongly bent in anterior view and straighter in lateral view 



but the St. Fort animal is considerably crushed; the tibia and 

 libula both show slight differences, and the bones of the feet are 

 slightly more slender and longer in the St. Fort animal. 



When compared with the type of M. harriesi, however, the differ- 

 ences in the foot are not so great; and in view of the fact that 

 van Hoepen's specimen in closer to the type than is the South 

 African Museum animal which I have referred to M. harriesi, I 

 cannot refrain from including it in the same species. Four speci- 

 mens of M. harriesi are thus known - the type, the South African 

 Museum animal, the bones described by Dr. van Hoepen, and a 

 partial skeleton in the Durban Museum. Of these, the first and last 

 arc from the one locality, the third from a closely-neighbouring area, 

 and the other from some distance away and a slightly lower hori- 

 zon. From them we can see the amount of individual variation 

 that may occur within one species; and such variation should be 

 taken into account when the identification of forms is under con- 

 sideration. 



Type. Bones of fore limbs - - S. A. Mus. Cat. No. 3394. 



Locdlif//. Foutanie, Fouriesburg, 0. F. S. 



Horizon. Top of lied Beds. 



