AKSINOITIIERIUM. 
55 
arc the ectal (ec.), which is the smaller and is convex from before backwards, 
and the snstentaciilar (sits.), which is much larger, flat anteriorly and concave behind. 
Text-fig. 32. 
Left calcaueum and astragalus of Arsinoitherium zitteli : 1 A, calcaneuin from above ; 1 b, distal surface of 
calcaneum ; 2 a, tibial surface of astragalus; 2 b, anterior view of astragalus; 2 c, distal surface 
of astragalus. 
cuh., facet for cuboid ; ec., ectal facet ; Jih., fibular facet ; n., notch in binder border of tibial surface ; 
nav., navicular facet ; sus., sustentacular facet ; ? t., facet for tibiale ; t.c., tuber calcis ; tih., surface for 
tibia. 2 nat. size. 
