Fauna and Stratigraphy of the Stonnberg Series. 405 



All are slightly expanded at the ends, with the ventral surfaces 

 rounded. They call for little comment, being of the type seen in 

 Sellosaurus fraasi, figured by von Huene, with the exception that the 

 zygapophyses stand somewhat higher from the centrum in Aetonyx. 

 The dorsal spine is very small. 



In the other series the centra only are preserved. They vary in 

 length from 33 mm. to 26 mm., and are thus anterior to those 

 already described. The ventral surface of the centrum is rounded 

 but in its posterior half it is somewhat flattened with two short 

 incipient keels flanking the flattened portion. These keels arise from 

 the small oblique ventral face of the hinder end, which carried a 

 small chevron. 



Type. Partial skeleton, S. A. Mus. Cat. No. 2768, 2769, 2770. 



Locality. Foutanie, Fouriesburg, 0. F. S. 



Horizon. Top of the Red Beds, Storinberg Series. 



There are in the Durban Museum collection several bones which 

 I ascribe to a large specimen of this species. They are from Fou- 

 tanie, Fouriesburg, but it is uncertain whether all belong to the 

 one animal although the probability lies in that direction. They 

 consist of metatarsals I-III of the right side, metatarsal I of the 

 left side, the distal end of a fibula and the distal end of a tibia 

 the latter somewhat doubtfully assigned to this species. 



The metatarsals of the right foot are approximately of equal 

 length with those of the type Massospondijltts Jutrriesi; but they are 

 more slender. The 1st metatarsal differs from that of Massospondylus 

 in having a narrower proximal end, the medial upper- edge being 

 more convex, and in the slope of the distal end being much more 

 oblique with the lateral portion of the articular surface very much 

 swollen. The total length of the left metatarsal I is 82 mm. 



*&' 



The distal end of the fibula differs from that of M. harriesi in 

 having a more flattened shaft and less prominent ridges at the 

 distal end on the posterior face. 



DROMICOSAURUS GRACILIS v. Hoepen. 

 1920. van Hoepen. Ann. Transv. Mus. VII, 2. p. 103. Pis. XIII XVI. 



This is a form slightly larger than Massospondylus carinatits, but 

 closely allied to Massospondylus and Aetonyx. The type consists of 

 fragments of humerus and radius, a fairly complete cervical vertebra, 



