20 ANTHROPOID APES. 



The gluteal muscles are not strongly developed. 

 The tuberosity of the ischium projects in a somewiiat 

 angular form. 



While the external sexual organs of the male are 

 so covered by the wrinkled skin of the abdomen 

 that they are not prominent in their passive condi- 

 tion, those of the female are, on the contrary, very 

 aj^parent ; the external lips of the vagina, provided 

 with large nymplise, and a large clitoris, are only 

 apparent when the sexual instiTict is excited. 



The thighs are covered with strong muscles, which 

 appear to be smoothed off on the inner side, and 

 somewhat arched on the outside. The lower part of 

 the leg is also muscular, and its section is of a long- 

 oval form ; the region of the calf is more strongly 

 developed than in other anthropoids. The bones of 

 the foot are not at all prominent, and the same 

 remark applies to those of the hand. The contour 

 of the back of the long, broad foot is flat ; the sole is 

 convex, covered with strong muscles, and padded 

 with layers of fat. When the animal puts the sole 

 of the foot on the ground, its muscles go back to the 

 region of the heel, and forward into the inner side 

 of the foot, thus presenting the primitive formation 

 of a heel. 



The great toe, as in all apes, is detached like a 

 thumb from the other toes, and can be used as such. 

 The metatarsus serves as a base for its projection, in 

 the same manner as the thumb starts from the fore 

 part of the contour of the wrist. The great toe 

 sometimes extends as far as the joint between the 

 first and second phalanges of the second toe, some- 



