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The American 

 Hepresentatives of Distomum cygnoides. 



J. Stafford, M.A., Pli.D., 



Montreal, Canada. 



AATith plate 19. 



Distomum cygnoides Zeder, from the urinary bladder of European 

 Irogs, has been known since 1785, wlien it was discovered by 

 LoscHGE in Fiana escuJenta. Its name dates from Zeder's work of 



1800. RüDOLPHI, DUJAEDIN, DlESING, PaGENSTECHER, VON LiNSTOW, 



and Looss should be especially mentioned in connection with its 

 literature. 



In America reference has been made to this species by Leidy, 

 Bensley, and myself. The brief notes of Leidy are confined to ex- 

 ternal appearance and habitat; and as nearly as I can judge the 

 species he described was No. 4 of this paper. As he reported, 

 however, from Uana pipiens, JRana palustris, Bana halecina, Sala- 

 manclra maculosa, Salamandra rubra, and Salamandra salmonea, it 

 may be taken for granted that he did not always have the same 

 species. Bensley described "Two forms of Distomum cygnoides", but 

 hesitated to regard them as distinct from each other. Variety A 

 he took for the commonly described European form, while variety B 



