428 Annals of Hie South African Museum. 



EUCNEMESAURUS FORTis, v. Hoepen. 



1920. van Hoepen. Ann. Transv. Mus. VII, 2. p. 93. Pis. XI, 



XII, XIII fig. 1. 



The type of this form consists of the proximal half of a femur, 

 ;i complete tibia, a proximal portion of a pubis, portions of dorsal 

 and caudal vertebrae and some fragments, of a large form. 



In addition to the comparisons made in the original description, 

 the following may be added. The tibia approximates in size to that 

 of Melanorosaurus readi, but the proximal end appears to be thicker 

 (although in M. readi it is somr\\h;it incomplete). Further, the 

 proximal end slopes down to the shaft more gradually in E. fortis 

 than in M. readi, and the shaft is more slender in the latter form. 

 The differences, however, are not very acute and may well be merely 

 specific. Until further comparisons are possible, however, there can 

 be no great harm done in retaining separate generic names for the 

 two forms. The femora, as far as they can be compared, seem 

 different. The proximal end is broader in M. readi, owing to the 

 f:n-i that the lateral border does not pass so abruptly into the proximal 

 bonier in E. fortis. In the latter, too, the fourth trochanter seems 

 to occupy a slightly more medial position. In the former character, 

 Eucnemesaurus occupies an intermediate position between Plateosaurus 

 and Melanorosaurus. 



From Plateosaurus cullingwortlti the tibia of Eucnemesaurus differs 

 markedly in general shape, the shaft of the former being much more 

 slender in its middle portion ; the articular surfaces are also of 

 different shape. 



Ti/pe. In the Transvaal Museum. 



Locality. Zonderhout, near Slabberts, 0. F. S. 



Horizon. Red Beds (probably about half way up.) 



MELANOROSAURUS, gen. nov. 



This genus is characterised by the following features: Vertebrae 

 lighter and smaller than those of Gresslyosaurus and Euskelesaurus 

 when compared with the length and size of the femur; humerus 

 with lateral process sharply bent over, proximal edge forming a 

 moderately high bow, less marked than in Gresslyosaurus; femur 

 with straight shaft, whose lateral border forms approximately a right 

 angle with the proximal surface at the upper, outer corner, and with 

 lower end of fourth trochanter below the middle of the femur; distal 

 end of tibia broader in front than behind. 



