1904.] 



FROM MADAGASCAR AND EGYPT. 



169 



material is necessary before the precise affinities of this bird can 

 be fnlly determined, probably from no similar fi'agment of any 

 other bone of the skeleton could so mncla infoianation be derived. 

 The outer condyle, the upper angle of which extends some 

 distance up the antero-external border of the bone, seems to be 

 larger in proj)ortion to the inner than in the other Ratites 

 except possibly Struthio. The condyles are very distinctly 

 separated by a very well-marked intercondylar groove, in this 

 respect more resembling the tibire of Gasuarms and Bhea, and 

 differing from those of uE'pyornis and Struthio, in which the 

 groove is very shalloAv. The post-condylar processes are not 

 nearly so prominent as in Strihthio, but about as in Bromceus ; 

 the outer post-condylar process does not extend nearly so far up- 

 wards as the condyle does anteriorly, and is sharply separated from 

 it almost at a right angle (see text-fig. 15, B, a.) which forms the 

 most distal point of the bone. The consequence of this arrange- 

 ment is that the condylar articular surface looks more forward 

 than is usually the case, though some approximation to this con- 

 dition is seen in Struthio, and still more in Bhea. The surface 

 between the post-condylar processes is slightly concave and passes 

 gently into the posterior surface of the shaft, which, like the whole 

 articular end of the bone, is strongly compressed from before 

 backwards. The latei'al faces of the condyles bear deep pits for 

 the attachment of ligaments (text-fig. 15, B). 



Text-fi^. 15. 



Distal end of left tibio-tarsus of Eremopeztis eooauns. 



A. From front. B. From side. C. From back. 



a., angle between outer condj'le and post-condylar surface ; e.ff., extensor groove; 

 i.e., inner condyle ; o.c, outer cond^de ; f., tubercle marking position of 

 extensor bridge. 



The figures are % natural size. 



The posterior face of the shaft passes by a gentle slope into the 

 sharp antero- internal border of the bone, which is continuous with 

 the upper angle of the inner condjde, as in Casuarius and Droma'us. 

 The anterior face of the shaft near its inner border is deeply 



