368 Annals of ilie South African Museum. 



the ischium, with a long dorsal border. There is a long pre- 

 acetabular portion with a bluntly-pointed extremity. 



The ischium is of the usual Crocodilian form. Yentrally it forms 

 a long union with its fellow by means of a straight suture 15 mm. 

 long. The ventral portion of the bone is a triangular plate with an 

 acute posterior angle and a more obtuse anterior angle. The dorsal 

 portion of the bone is bifurcated, with a larger posterior portion for 

 articulation with the ilium, and a prominent anterior protuberance 

 directed upwards and forwards for articulation with the unossilied pubis. 



On neither side is the prepubis complete. Each is a slender bone 

 with a spatulate anterior portion. The two bones do not meet 

 ventrally and must have been connected by cartilage. The proximal 

 end is slightly expanded and lies at present some distance in front 

 of the ischium and wholly disconnected from it. The length was 

 23'5 mm., and the greatest breadth at the spatulate end 4-5 mm., 

 while at its narrowest the shaft is just under 1'5 mm. broajl. The 

 shaft is nearly circular in cross-section. 



Femur. The right femur is partially preserved. It consists of a 

 slightly bent shaft with somewhat swollen ends. The ends of the 

 bone are spongy while the shaft is hollow - a condition which is 

 seen in the other bones of the hind limb and the pelvis. The length 

 is about 48 mm. The head is 4'3 mm. broad, the shaft 3-8 mm. 

 In cross-section the shaft is a somewhat flattened oval. The distal 

 end has two condyles separated by a well-marked intercondylar groove. 

 The outer condyle is larger than the inner. The width of the distal 

 end is 8 mm. 



Tibia. The tibia is 4 or 5 mm. shorter than the femur. It is a 

 very slightly curved shaft with an expanded proximal end flattened 

 antero-posteriorly. The iibular side of the shaft is somewhat ilattened, 

 while the inner side is regularly curved. Distally the bone widens 

 out. The breadth of the proximal end is 6 mm., while the width 

 of the shaft is 3 P 5 mm. 



Fibula. The fibula is approximately of the same length as the 

 tibia, but is a much more slender bone. Between the shaft and the 

 proximal end there is a narrow neck. The shaft has a longitudinal 

 ridge on the inner anterior border. The distal end is not seen. 

 The shaft is 2 mm. broad. 



Tarsus. The structure of the tarsus is somewhat difficult of deter- 

 mination. The cleavage of the rock has broken the bones across 

 the middle so that neither the dorsal nor palmar surfaces are seen. 

 The astragalus is much larger than the calcaneum, which is a small 

 bone with a small posterior tuber joined to the main body of the 



