416 Prof. H. G. Seeley on Hortalotarsus skirtopodus. 



back and slightly concave from side to side. There is no 

 anterior ascending process to the astragalus. The bone is not 

 in very close union with the tibia. 



Fig. 3. 



l<Yniur. 



Tibia. 



Os calcis. Astragalus. 



Anterior aspect of bones of the fore leg and inferior aspect of 

 metatarsal bones_2~5 and phalanges. 



The calcaneum is relatively small and fits on to the distal 

 end of the fibula. It is not intimately united to the astra- 

 galus, but simply articulated. It is about y 7 ^ inch wide and 

 1% inch deep ; it is convexly rounded, especially in front, but 

 the external lateral border is occupied by a ligamentous pit, 

 which contributes to make the transverse measurement on the 

 anterior side less than that on the posterior side. 



