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PLATE B. 



FIGS. 



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



adult female Chondr acanthus zei De la Roche in situ. 

 (x2J.) 



2. Adult female of Chondracanthus zei removed from its 



host. ( x 2.) 



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



female specimens of Lernseopoda 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.) 



