THE CHIMPANZEES AND ORANGS. 29 



Fig. 10. The articular surface of the same end. 



Fig. ] 1. The back part of the distal end of the right radius of an adult male European. 



Fig. 12. The articular surface of the same end. 



PLATE V. 



Fig. 1. The radial side of the right ulna, wanting the distal epiphysis, of an adult but 



young male Troglodytes Gorilla. 

 Fig. 2. The back part of the olecranon of the same bone. 

 Fig. 3. The front surface of the same bone. 



Fig. 4. The radial side of the right ulna of an adult male Troglodytes niger. 

 Fig. 5. The back surface of the olecranon of the same bone. 

 Fig. 6. The distal end of the same bone. 

 Fig. 7. The front surface of the same bone. 

 Fig. 8. The radial side of the ulna of an adult male Australian. 

 Fig. 9. The back part of the olecranon of the same bone. . 

 Fig. 10. The front part of the same bone. 

 Fig. 11. The distal end of the same bone. 



Fig. 12. The front part of the proximal end of the ulna of an adult male European. 

 Fig. 13. The back part of the proximal end of the same bone. 



PLATE VL 



Fig. 1. The back surface of the left os innominatum of an adult but young male 



Troglodytes Gorilla. 

 Fig. 2. The acetabular cavity of the same bone. 



Fig. 3. The back surface of the left os innominatum of an adult male Troglodytes niger. 

 Fig. 4. The back surface of the left os innominatum of an adult male Australian. 



PLATE VIL 



Fig. 1. The back view of the right femur of an adult but young male Troglodytes Gorilla. 



Fig. 2. The upper end of the same bone. 



Fig. 3. The lower end of the same bone. 



Fig. 4. Back view of the right femur of an adult male Troglodytes niger. 



Fig. 5. The upper end of the same bone. 



Fig. 6. Back view of the right femur of an adult male Australian. 



Fig. 7. The upper end of the same bone. 



