1906.] DIAPTUSAURIAN REPTILE. 597 



to have been covered by cartilage. Whether this cartilage has 

 only been a narrow border round the front of the bone, or a well- 

 developed prepnbie cartilage, the evidence does not conclusively 

 show. About the middle of the outer side of the pubis is a well- 

 marked bony process. There is a large pubic foramen in the 

 bone near its posterior and upper corner. The greatest length of 

 the pubis is 25 mm., and the greatest breadth 19 mm. 



In fig. 15 (PL XLI.) is shown a side view of the pelvis slightly 

 restored as regards the acetabulum. All the bones are shown in 

 what is believed to be true side view. In fig. 16 there is 

 given for comparison a view of the pelvis of the large South- 

 African Phytosaur Erythrosthchtis. Here the pubis and ischium 

 are also of the plate-like type, but the modification is carried 

 further than in Howesia. The pubis is bent down still further 

 and the lower part stouter. The symphysial portions of both 

 pubis and ischium are directed more inwards. Fig. 18 shows 

 the left pubis as viewed from below and slightly from behind and 

 the outer side. 



Portions of both femora are preserved, and both the upper and 

 lower ends of the left are in good condition. The bone is slightly 

 curved downwards towards its lower end, as is the case in the 

 femur of the Crocodile. Both ends have been largely cartilaginous. 

 PI. XLI. fig. 20 represents the appearance of the proximal end. 

 There is a large trochanter which has probably been devoid of 

 cartilage, and a large, flat, semicircular surface which has supported 

 the cartilaginous head. The lower end of the bone is broad and 

 powerful, and has doubtless had large cartilaginous condyles. 



Tibia and Fibula. 



The left tibia is practically complete, but the lower third is 

 slightly displaced, owing to a fracture which occurred during the 

 animal's life and united with the fragments in a slightly false 

 position. The bone is much expanded at the proximal end, which 

 ha,s a rounded upper surface and had probably little cartilage on 

 it. Its greatest width is 16 mm. The bone is much constricted 

 in the middle, measuring only 5 mm. across. The lower end is 

 not much expanded, and probably had a well- developed pad of 

 cartilage. The total length of the bone is 50 mm. 



The fibula is slender in the middle and considerably expanded 

 at both ends. It has a slight double curve. It is probably a little 

 shorter than the tibia. 



In fig. 21 a view is given of the front of the tibia restored so 

 far as the correction of the slight displacement of the lower 

 fragment. Fig. 22 shows the tibia and fibula as preserved in the 

 specimen. 



Pes. 



A considerable portion of the right foot is preserved, and 

 though some of the bones are displaced it is possible to make a 

 fairly satisfactory restoration of both the tarsus and metatarsus. 



