(256) 



PLATE B. 



Fios. 



1. Part of the gills of a dory (Zeus faber Linn.), shewing an 



adult female Chondr acanthus zei De la Roche in situ. 

 (x2i.) 



2. Adult female of Chondr acanthus zei removed from its 



host, (x 2.) 



3. Gill of a salmon (Salmo salar Linn.), shewing adult 



female specimens of Lernaeopoda salmonea (Gisler) 

 attached to the ends of the gill-filaments. The salmon 

 was captured in the river Dee, near Aberdeen; the 

 parasites adhered to the gill-filaments in considerable 

 numbers, their white colour shewing distinctly against 

 the red colour of the gills. (Nat. size.) 



(Reproduced from photographs.) 



