PLATE 2 



EXPLANATION OF FIGURES 



The photographs in this plate, which show the influence of temperature on 

 the distribution of the retinal pigment of fishes, are all at a magnification of 

 170 diameters. 



9 Abramis, 5°C. in the light. 



10 Abramis, 25°C. in the light. 



11 Abramis, 5°C. in the dark. 



12 Abramis, 25°C. in the dark. 



13 Carassius, 5°C. in the light. 



14 Carassius, 25°C. in the light. 



15 Carassius, 5°C. in the dark. 



16 Carassius, 25°C. in the dark. 



194 



