PLATE III. 



PIGMENTATION OF THE LOWER SIDE OF A 

 FLOUNDER (PLEURONECTES FLESUS) WHICH 

 WAS EXPOSED TO DAYLIGHT REFLECTED 

 FROM A MIRROR, FROM SEPT. 189O TO 

 NOV. 1 89 1. THE SPECIMEN WAS ABOUT SIX 

 MONTHS OLD AT THE BEGINNING OF THE 

 EXPERIMENT, AND THEN HAD NO PIGMENT 

 ON THE LOWER SIDE. REPRODUCED BY 



PERMISSION OF THE ROYAL SOCIETY FROM 

 PHIL. TRANS. 1893. B. 



