THE HIND LIMBS. 143 



The Fibula. (Plate XLVI, figures 1-4.) 



The fibula is slender, aud entire, witli artienlar faces well marked at 

 each extremity. The proximal end is sonicwliat .'X))anded, and has the 

 articular face for union with the tibia obli(|ue, and sub-oval in outline. 

 The shaft is somewhat twisted, ;ind sub-triangular in transverse section. 

 The di.stal end of the filnda is larger than that above, and quite rugose. 

 Tlie articulation for union with the astragalus is large, and |)laced 

 obliquely, as shown in Plate XLVI, figure 4. 



In some specimens of the Dinocerafu, and probably in all, tlie fibula 

 met the calcaneum, as in Conjpliodon, and the Ai'tiodact} Is. 



Measurements of the fibida in two individuals of Dinoceras are as 

 follows : 



3Teasw\iueiiff: nf Fihuhi. [Dinoceras mirabi/e, No. 1208.) 



m. 



T.ciigtli of fibula (approximate), .350 



1 )iameter.s of proximal end, - . . .040-045 



Diameters of proximal articular surface, 028-033 



3Ieasiirenients of Fibula. [Dinoceras mirahile. No. 1210.) 



Diameters of shaft, .028-.020 



Diameters of distal end, .040-.0T0 



Diameters of distal articular surface (approximate), .050-045 



The Patella. (Plate XLVI, figm-es 5-8.) 



The patella in the Dii/orrrafa is a large bone, and resembles, in its 

 general features, that of the elephant. Its external surface is quite 

 rugose. The articular surface fm- union with the condyles of the femur 

 is sub-oval in outline;, concave 1'rom above downward, and transversely 

 convex in consecpience of tlie usual median swelling. The general 

 characteristics are well )-epresente<l in Plate XLVI, and its jxisition in the 

 skeleton is shown in tlu^ I'cstorations at the end vi' the \'olinne. Plates LV 

 and LVI. 



