THE PERCEPTION OF LIGHT 



607 



Figs. 752 to 755. — The Eyes of Placentals. 



To contrast the large prominent eyes of nocturnal Placentals (Figs. 752-4) 

 with the relatively small eyes of an arhythmic Placental (Fig. 755) (Zool. 

 Soc, London). 



Fig. 752. — The fruit bat, Pleropus. 



Fig. 753. — The two-toed sloth, 

 Cholcenus. 



Fig. 754. — The potto, Perodicticus 

 potto. 



Fig. 755. — The langur, Pithecus 

 nemceus. 



