410 Iirtnois State Ldhordtorij of Natund History. 



species, Alasnwdonta rugosa and Lampsilis Ugament'inus, 

 slioM^ no infestation with the generally prevalent Aspldogaster, 

 and this is especially noteworthy in the case of the latter, 

 whose infestation with other parasites is both frequent and 

 severe. 



Table III. brings into comparison the number of kinds of 

 parasites found infesting individuals of each host species and 



