H- 



PA- 



FIG. 421. Hind-limb of a gibbon. From a Specimen. 



H.,'Head of femur ; FE., femur ; PA., patella ; T., tibia FL, fibula ; A., astragalus, 

 which forms most of the tarsal portion of the crurp-tarsal ankle-joint ; C., the 

 calcaneum or os calcis, to the fibula side, projecting backwards as the heel ; 

 D.T., the second or distal row of tarsals or ankle-bones; MT.I, the first 

 metatarsal ; i, the hallux or first toe ; MT. V., the fifth metatarsal 15, the fifth or 

 little toe. 



