198 STRUCTURAL AND SYSTEMATIC ZOOLOGY 



organ of touch, and most versatile. Both hand and 

 foot are relatively shorter than in the apes. The foot 



a b 



FIG. 193. Foot (a) and hand (b) of the gorilla. 



is plantigrade ; the leg bears vertically upon it ; the 

 heel and great toe are longer than in other primates ; 

 and the great toe is not opposable, but is used only 

 as a fulcrum in locomotion. The gorilla has both an 



FIG. 194. Australian savage. 



inferior hand and inferior foot. The hand is clumsier, 

 and with a shorter thumb than man's; and the 



