Fig. 48. Diagrammatic meridional 

 section of the eye of the lemur (Galago 

 mala). X 3. 



Fig. 49. Diagrammatic meridio- 

 nal section of the eye of the lemur 

 (Nycticebus tardigradus). X 3. 



Fig. 50. Diagrammatic meridional 

 section of the eye of the rhesus monkey 

 (Macaca mulatta). X 3- 



Fig. 51. Diagrammatic meridio- 

 nal section of the eye of the noc- 

 turnal platyrrhine monkey (Nycti- 

 pithecus). X 3. 



68 



