48 



Annals of the Carnegie Museum. 



we are describing. The bone is very nearly as long as in T. valid iim. 



The ends are not expanded as in the latter form, while the shaft is 



flatter, due in part to crushing. 

 The superior end carries a heavy 

 and bifid spine, while the upper an- 

 terior extremity displays the broad 

 groove for the patellar ligament as 

 in Titanotheriiim. The cnemial crest, 

 though prominent, does not descend 

 low on the shaft, another feature re- 

 calling what may be observed in T. 

 validiim and in the Uinta specimen 

 figured by Scott and Osborn.^^ The 

 anterior border of the distal . trochlea 

 was found weathered off, but the pos- 

 terior surface is complete and pre- 

 sents a very prominent descending 

 process on the median ridge of the 

 articulating trochlea very similar to 

 what is seen in the later Uinta form 

 Fig. 13. Diploceras oshorni Peter- and in Titanotherium. 



son. I, Distal end of femur. (Para- 



type. No. 2860.) X 

 view of tibia. (Paratype 

 2862.) X i 



From the material at hand it is 



2, Dorsal 1 • 1 !• 1 r r^- i 



j^ shown that the hind limb of Diplo- 

 ceras osborni corresponds well in length 

 with the fore limb. 



M EASUREMENTS. 



Tibia. 



No. 2862, 

 Mm. 



Greatest length, approximate 415 



Transverse diameter of head 100 



Transverse diameter of shaft, middle region 48 



Transverse diameter of distal end, approximate 75 



The hind foot of No. 2860 is represented by the calcaneum, the 

 astragalus, and the second and fourth metatarsals. 



When compared with the Princeton specimen from a higher Uinta 

 level and also with the Oligocene genera, the tuber of the calcaneum in 



15 If the illustration on PI. VIII, Fig. 6, in Scott and Osborn's publication is 

 5 of nature, as is that of the femur in the same plate, the tibia of that form is 

 actually shorter than that in the genus here described. 



