South African Fossil Reptiles a?id Amphifitu. 



Ill 



All the presacral vertebrae carry ribs. The presacral ribs are 

 possibly double-headed ; the articular end is long and broadened. 

 The ribs are long, slender, and curved ; their ventral surface is 

 longitudinally grooved. The anterior sacral rib is strong and 

 fairly long. It arises from the anterior portion of the centrum 

 and is directed strongly backwards. It has a swollen end ioi 

 articulation with the ilium. Only a very small portion of the 



SCAR 



FIG. 45. Impression of type. Macroscelesaurus janseni. x 0.48. 



2nd sacral is preserved ; it was very much more slender than the 

 first, but articulated with the ilium. The 3rd sacral rib is a fairly 

 slender rib arising on the anterior half of the centrum and directed 

 outwards and slightly forwards to articulate with the ilium. Its 

 distal end is in contact with that of the 2nd sacral rib. There 

 is no evidence of abdominal ribs. 



The pectoral girdle is not well preserved and the details of the 

 structure are difficult to determine. The scapula is only seen 

 in its lower .half. It has a fairly narrow shaft and a broad proximal 

 end, but apparently had no distinct acromion process. The 

 precoracoid is partially seen. It is a medium-sized bone with a 



