44 Annals of the South African Museum. 



lower half of the posterior border of the ischiurn. is missing, but 

 below the protuberance the border thins rapidly. 



The pubic foramen occupies relatively the usual position. The 

 thickening for the pre-pubic cartilage, so prominent in other 

 Pareiasaurians, is not present here. Downwards from the aceta- 

 bulum the pubis is bent slightly backwards, but its thickness 

 reaches only 10 mm. 



The sacral ribs, apparently four in number, fitted into a very 

 shallow groove on the inside of the ilium. The first, which was 

 much expanded distally, seems to have given support by curling 

 round the lower border of the ilium. The second and third ribs 

 were fairly stout. 



The shape of the ilium and of the acetabulum, the large ischial 

 protuberance, the absence of the thickened pubic brim, and the 

 diminutive size are all new features displayed by this pelvis, and 

 serve to distinguish it from any hitherto described Pareiasaurian. 



The vertebral remains consist of a series of six dorsal vertebrae, 

 and a number of connected caudal vertebrae. 



The dorsal vertebrae are possibly the 12th to 17th inclusive, and 

 are characterised mainly by the shortness of the neural spines, 

 and the general size, which is less than that of any known 

 Pareiasaurian vertebrae, with the exception of those of Anthodon. 

 Those preserved differ but little from one another. The centra are 

 as long as they are broad, but constricted considerably in the middle, 

 so that they have an elongated appearance. On the lower side both 

 ends of the body are truncated obliquely, so that, although no inter- 

 centra are preserved, they were probably well developed. The 

 following measurements of what is possibly the 13th may be taken 

 as typical of these dorsal vertebrae : Total height of vertebra, 

 107 mm. ; width across transverse processes, 120 mm. ; length of 

 centrum, 41 mm. ; height of spine above junction of postzyga- 

 pophyses, 18 mm. The transverse process is continued downwards 

 and forwards to the front of the body, and gives rise to a surface, 

 52 mm. long, for the articulation of a single-headed rib. From 

 the transverse process the anterior zygapophysis is formed, lying 

 at about the level of the top of the body. 



There is a continuous series of eleven caudal vertebrae, 

 comprising probably the 5th to the 15th inclusive. The bodies 

 of the first three of the series differ from those of the praesacral 

 vertebrae in that they are not medially constricted. The total 

 height of the 2nd of the series is 56 mm. ; the body is 24 mm. long ; 

 the width between the points of the postzygapophyses is about 



