158 



LESLIE B. AREY 



Measurements from the retinas of five Fundulus which had been kept at 6°C. in the 

 dark; the values are in micra and represent measurements taken along axes coin- 

 ciding with radii of the eyeball 



Measurements from the retinas of five Fundulus which had been kept at25°C. in the 

 dark; the values are in inicra and represent measurements taken along axes coin- 

 ciding with radii of the eyeball 



indicates that in these animals a lengthening of the inner mem- 

 bers is favored by a high temperature. 



A series of measurements of chief cones in the light failed to 

 show any differences at the extreme temperatures. 



(4) Carassius. The retina of Carassius, as well as that of 

 Fundulus, has prominent double cones. 



In the few eyes measured, the chief cone elongated with in 

 creased temperature (figs. 23, 24) but the accessory cone did not 

 change its position, at least to any extent. 



Table 9 summarizes the results from typical retinas. 



