96 



external parasites of fishes which are classed in a family called the Tristomidse. 

 Most of these forms possess a small sucker on either side of the anterior end of the 

 body as well as one large posterior sucker, hence the name of the family. The 

 glandular areas described on the anterior end of Phyllonella represent the anterior 

 suckers. The Tristoniidas belong to the order Trematoda. 



