NEW REPTILES FROM THE UPPER TRIAS 



691 



_^; 



i 



border; expanded below, the gently convex surface looking ventrad 

 and mesad, extending a little less than a third of the length of the 

 bone. Below this process, on the inner border, there is a small con- 

 vexity, which may, perhaps, represent 

 the tricipital process. Inner ventral sur- 

 face above deeply concave; bounded 

 above and on the side by the margin of 

 the capitular projection and that of the 

 median process. Lateral (deltopectoral) 

 crest elongate and thickened, very pro- 

 tuberant, extending a little more than 

 one-half the length of the bone (ten 

 inches), directed obliquely outward and 

 ventrad; outer margin convex, but pro- 

 duced into an obtuse angle below, the 

 thickness somewhat greater below. In 

 the specimen this process has been shghtly ^c^ 

 crushed dorsad. Posterior surface proxi- 

 mally gently convex, concave on the outer 



., . , 1 111 1 1 Fig. 3. — Left humerus of 



Side, with the rounded head strongly Eubrachiosaurus browni. 

 protuberant. Shaft below lateral crest 



much constricted, its conjugate diameters being nearly equal. Entepi- 

 condylar canal directed nearly downward, the flattened bridge over 

 it being the continuation of the lower margin of the lateral crest. 

 Entepicondyle thickened and roughened for muscular attachment; 

 ectepicondylar or supinator ridge broad, arising as high up as the 

 upper margin of the external opening of the epicondylar canal, and 

 nearly as high as the lower end of the lateral crest, its border 

 nearly semicircular in outHne, gently curved forward. Olecranal 

 fossa large, shallow, triangular, nearly fiat. Radial articular capitu- 

 lar surface large, convex, forming a small, rounded process on the 

 dorsal side and a large one on the ventral side. Ulnar articular sur- 

 face smaller, but extending nearly as far ventrad, the intervening 

 trochlear groove rather deep and narrow. 



Scapula. — An elongate bone, presenting the essential character- 

 istics of a dicynodont scapula, was found lying with its distal end 

 impressed upon the inner side of the iHum, and close by the humerus 



