1873.] ^d [Cope. 



Measurements of Femur. 



M. 



Expanse of great trochanter 0.230 



Diameter of head. '109 



" " shaft at middle 093 



" ahove condyles 152 



" at extremity of condyles 139 



" (vertical) of inner condyle 125 



The tibia is perfectly preserved. It is short and stout and with massive 

 extremities. The outer basal part of the spine remains and is prominent. 

 The cotyli are not oblique ; the inner is subround, the outer transverse, 

 widening outwardly ; their long axes are at right angles to each other. The 

 crest is a low ridge of contact of the cotyli. The superior fibular face is 

 a transverse oval ; the inferior much smaller than in E. })ressicomis. The 

 shaft is contracted, and flattened behind and on the inner side. The dis- 

 tal extremity is transverse, less truncated for the fibula than in E. pressi. 

 cornis, less convex behind, and with a less prominent external malleolus- 

 The point dividing the astragalus behind is more prominent. 



Measurements of Tibia. 



M. 



Total length 0.398 



Diameter head longitudinal 080 



" " transverse 138 



" shaft transverse 0G3 



" " antero-posterior 000 



" distal articulation " 077 



" " " transverse 113 



" " extremity, fore and aft 093 



" " " transverse 135 



These measurements show that this bone is considerably shorter than 

 in E. pressicomis, though of equal distal diameters. In both species the 

 measurements considerably exceed those given by Marsh for his Titano- 

 therium (?) anceps. The form of the articular extremities differs from 

 both in being more narrowed and transverse. 



The fibula is larger proximally and smaller distally than in E. pressi- 

 aornis. Diameter proximal articular face .039 ; of the distal .045. 



The astragalus is similar in size and form to that of E. pressicomis, but 

 differs in two points. The posterior margin is deeply incised for the lig- 

 amentous insertion, and the outer lobe is clearly cut to this fossa, on the 

 inner side. There is a pit for a ligament on the convexity of the inner 

 part of the middle of the tibial articular face. A third difference is seen 

 on the inferior face. The inner calcaneal facet is longer and narrower, 

 and is margined on the inner side by a large fossa parallel to its axis, 

 which is wanting in the other species. The cakaneumte short and wide ; 



