45 
give it an unusual appearance. Several times we have 
attempted to ascertain the fate of this copepod when the 
lobster casts its shell, but so far have been unsuccessful. 
None of the lobsters that moulted in our tanks happened 
to have parasites on the gills. 
The Branchiurid, Argulus foliaceus (Linn), has 
been found on trout sent to us for examination from the 
Ribble. 
