154 ON THE MIGRATIONS AND THE GROWTH OF PLAICE. 



Pathology. — Several plaice were marked which were 

 abnormal as to colour, and one of these, No. 8i8, was re- 

 captured and forwarded to me. When caught it had a rect- 

 angular white patch with a central spot of pigment on the 

 upper side near the ventral fin, and the label was attached 

 near the edge of the spot to mark its position. When it was 

 sent to me, after a free period of 288 days, it still presented 

 the patch and the central spot, so far as I could see, un- 

 changed either in area or appearance. It was a male, and 

 its abnormal colour did not have any effect upon its rate of 

 growth. 



