Vol. 56.] DICKANOZT60MA LEPTOSCELUS. 653 



condylar surface, on to which it curves convexly. The epicondylar 

 foramen is similarly situate to that in the humerus referred to 

 Gomphoynathus, but relatively smaller and elongated, has a wider 

 bridge, and does not extend so far distally. The foramen is partly 

 blocked with a small body wedged into it, which appears to be a 

 small terminal phalange of the foot. 



The articular condyles, two in number, are obliquely inclined 

 downward and outward, moderately convex, and defined by a 

 shallow oblique groove parallel to the inner border such that the 

 somewhat flattened inner condyle is nearly twice as wide as the 

 more prominent convex outer condyle, though they are both of 

 somewhat rounded rhomboid form. 



The most distinctive feature of the bone is the unbroken concave 

 longitudinal contour of the external border, which is equally unlike 

 Cynodraco and Gomphognathus, and is more like the isolated humeri 

 which Sir Eichard Owen referred to Dicynodon. 



Eesting upon the lower edge of the radial crest of the humerus is 

 a single terminal claw-phalange, presumably of the fore-foot of 

 the same animal. It is strong, | inch long, \ inch wide behind, flat- 

 tened below, convex above, with the extremity blunt and rounded, 

 and the surface moderately depressed. There are the usual lateral 

 grooves, narrow and faintly impressed ; and the curved contour of 

 the posterior border of the articulation appears to be faintly indi- 

 cated. The claw-digit is better preserved and more elongated than 

 in Platyjpodosaurus , while its blunt extremity is unlike the sharp 

 condition of the claws in Eury carpus. The remainder of the foot is 

 lost with the longitudinal joint bounding the slab. 



The Pelvis. 



The pelvis is represented by the right ilium, a part of the right 

 ischium, and part of the left ilium. The pubis is only indicated in 

 the acetabulum, and was covered by the ilium. The bones are 

 separate one from the other, and agree in this mutual relation and 

 in form with known Theriodonts ; while they differ absolutely from 

 the pelvic bones which have been associated with Dicynodonts, and 

 are usually anchylosed together. 



The two iliac bones now lie parallel one to the other, and are 

 pressed nearly flat. They were probably inclined to each other 

 originally at a considerable angle, but still may have met or approxi- 

 mated in the median line. The right bone is 3| inches long, and 

 2\ inches in extreme depth in the hinder part over the acetabular 

 wedge, which articulated with the head of the femur. The bone is 

 large and smooth, with its thin superior border forming a semi- 

 ovate contour, most rounded in front, where the bone is reflected 

 slightly outward and upward as in Plaiypodosaurus, on the mam- 

 malian plan. The inferior border of the bone from the articular 

 margin of the acetabulum to the anterior angle, is concave in 

 length, rounded from side to side, thickens as it extends backward, 



Q. J. G. S. No. 223. 2 x 



