• ■ i 



x^ 



J. G. Bradbury 

 a. Section of pearl from freshwater mussel, River Tay ( x 20) 



J. G. Bradbury 

 b. Goby infected with metacercariae of the herring-gull fluke, Cryptocotyle lingua ( x 1-3) 

 Plate VII EFFECT OF PARASITE ON HOST 



