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PLATE A. 



FIGS. 



1. Ventral surface of the pectoral fin of a flounder (Pleuro- 



nectes fiesus Linn.), with thirty-two adult specimens of 

 Lepeophtheirus pectoralis (Miiller) adhering to it. 

 (x3.) 



2. Head of a whiting (Gadu* merlangus Linn.), with part of 



the operculum removed to shew an adult female Lernaea 

 branchialis Linn, adhering to the gills. ( x 2.) 



3. Part of the gills of a flounder (Pleuronectes flesus Linn.), 



shewing the i( Cyclopoid" stage of Lernsea branchialis 

 attached to the ends of the gill-filaments. ( x 2J.) 



(Reproduced from photographs.) 



