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A Disciission of Certaiii Questions of Nomenclature, 

 as applied to Parasites. 



By 



Ch. Warclell Stiles, Ph. D., 



Zoologist, U. S. Bureau of Animal Industry. 



One of the most important, most scientific, and most admirable 

 papers which has ever been published on the Trematodes was issued 

 about a year ago by Prof. Arthur Looss^), of Cairo, Egypt. While 

 some helminthologists may for the tirae being remain rather reserved 

 in regard to certain of the genera which Looss has proposed, pro- 

 bably none of us will refuse to acknowledge that he has issued a 

 record-breaking work which calls for high admiration. Exact and 

 thorough as the article is, when viewed from the Standpoint of anatoray, 

 there are nomenclatural rulings adopted and propositions made, which 

 if geuerally followed, would result in serious confusion. On this ac- 

 count, the Zoological Laboratory of this Bureau has been endeavoring 

 to collect all of the technical names of Trematodes printed since 1758, 

 with their date of publication. By issuing such a list, together with 

 a general discussion of nomenclatural principles as applied to animal 

 parasites, it is hoped that the present confusion in the subject may 

 be reduced and future confusion avoided. Unavoidable circumstances 

 will delay the proposed paper, but the following pages have been ex- 

 tracted from the manuscript, now a year old, and are ofifered for publi- 

 cation, as certain questions involved call for an earlier discussion — 

 especially since the weight which Looss' opinion naturally carries with 



1) Weitere Beiträge zur Kenntniss der Trematoden-Fauna Aegyptens, 

 zugleich Versuch einer natürlichen Gliederung des Genus Distomum. 

 Retzius, in: Zool. Jahrb., V. 12, Syst., 1899. 



Zool. Jahrb. XV. Abth. f. Syst. 1 1 



