AKSINOITHERIUM. 
53 
stouter, having a larger cnemial crest ami a more regularly concave astragalar 
surface. 
'V\\o, Jihiila (text-fig. 31) ])ossesses a slender strongly-curved shaft with expanded 
articular ends. The up})er end bears on its tibial face it.') a flattened or even slightly 
concave facet for union with the tibia ; the outer face is swollen and roughened, and 
is partly di^ided into two by a longitudinal groove. The shaft is slender and is 
Text-fig. 31. 
Left fibula of ArsinoilJierium zittdi : A, inner (tibial) face ; B, outer face ; C, distal end. 
asf; surface for astragalus ; adc., surface for calcaneum ; e.m,, external malleolus ; t., distal tibial surface ; 
t.', proximal tibial surface, f nat. size. 
compressed from before backwards, bearing on its inner face a longitudinal ridge ; 
it is strongly curved, the convexity being on the tibial side. The distal third of the 
shaft is greatly expanded and deeply concave, being closely applied to the outer 
side of the distal portion of the tibia. Distally this deep concavity is closed by 
