Otoliths from group of Plaica 14^ in. in length and five years old, showing white 

 centre and four white rings. 



Otoliths from group of Plaice 18 in. in length and six years old, showing white 

 centre and five white rings. 



HOW TO READ THE AGE OF A PLAICE BY THE RINGS ON THE 

 OTOLITHS OR EAR-STONES. 



