Investigations in South African Fossil Beptilia and Amphibia. 75 



preacetabular process. The inner border is concave behind the 

 attachment of the sacral rib. 



The pubes are large and plate-like, broadly expanded in front 

 with a convex anterior margin. 



Hind limb. The hind limb of each side is preserved almost 

 completely, the only missing bones being one or two from the 

 tarsus. 



The femur is approximately straight, with expanded extremities. 

 The total length is 170 mm. The proximal end is swollen pos- 

 teriorly, and apparently somewhat flattened anteriorly. The maxi- 

 mum width of the proximal end is 62 mm., and of the distal end 

 55 mm. The distal end has two prominent flattened articular sur- 

 faces. The shaft is moderately robust, with a minimum antero- 

 posterior diameter of 25 mm. 



The tibia and fibula are bones with widely expanded extremities, 

 each bone being about half the length of the femur. The distal end 

 of each bone has apparently two faces, the tibia articulating with the 

 tibiale and intermedium, and the fibula with the intermedium and 

 fibulare. 



Most of the structure of the tarsus and pes is satisfactorily shown, 

 although two of the tarsalia are missing. The intermedium is 

 applied closely to the inner condyle of the fibula, lying between that 

 bone and the tibia. It is irregularly rhomboidal in shape on the 

 dorsal surface ; the length of the fibular side is 25 mm., its width 

 is 25 mm., and its height 28 mm. The tibiale and fibulare are 

 both lozenge-shaped bones, each articulating with the intermedium. 

 The tibiale is the larger bone, having a width of 36 mm. and 

 a height of 19 mm., while the fibulare is 24 mm. wide and 19 mm. 

 high. 



Of the tarsalia but two are preserved the first and what is 

 probably the third. The first tarsale supported exclusively the first 

 metatarsal. It is rectangular in shape, 16 mm. wide and 12 mm. 

 high. The third lies in such a position that it probably assisted in 

 the support of both the third and fourth metatarsals, a view which is 

 borne out by its ovoid shape. It is smaller than the first tarsale, 

 with a width of 15 mm. and a height of 10 mm. Lying between the 

 tibiale and the first tarsale is a small rectangular bone measuring 

 12 mm. by 6 mm. This is the centrale. 



The foot is short and heavy, larger than that of the fore-limb. All 

 the metatarsals are somewhat expanded at the extremities, the first 

 and last being shorter than the others. The digital formula is 

 2, 2, 3, 4, 3. The ungual phalanges are short and very bluntly 



