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external parasites of fishes -ivhich are classed in a family called the Tristomidfe. 

 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 PhyUonella represent the anterior 

 suckers. The Trislomidcc belong to the order Trematoda. 



r.,„ 



