8 



does the entry of the synonymy in any given case mean that this 

 synonymy is necessarily correct; it is simply quoting published syn- 

 onymy. The same statement refers to the hosts cited. 



In looking up the literature of any given species, the reader should 

 consult the cross reference (pp. 10 to 83) for the various genera 

 under which the species has been published, and the synonyms given 

 in the general entries; by looking up these references in the general 

 catalogue (pp. 84 to 383), all or practically all the references to the 

 species are obtained. 



Suggestions in publishing new names. — In indexing literature, 

 one is impressed with the differences in arrangement of the material 

 as published by different authors. S®me writers arrange the sys- 

 tematic portions of their papers in such a manner that it is an easy 

 matter to obtain the important data. Other authors are less care- 

 ful in this respect, and their material is arranged, in some cases, 

 in a style which almost defies indexing. 



As a very convenient style we would suggest the following dia- 

 grams : 



Genus FASCIOLA Linnaeus, 1758. 



1758: Fasciola Linn., 1758a, 644, 648-649 (hepatica [give here either the type species 

 or all of the species in the order given by the author]). [Give origin of 

 name, if desired.] 

 [Give here the synonymy in same style as foregoing entry.] 

 Generic diagnosis. — Fasciolidae, Fasciolinse [It is always very useful to give the 

 name of the family and subfamily]: [Here give the generic diagnosis.] 



Type species. — [If type has not been designated, state why the species in question 

 is now selected; as by first species rule, tautonomy, elimination, etc.] 



Species FASCIOLA HEPATICA Linnaeus, 1758. 



1758: Fasciola hepatica Linn., 1758a, 648-649 [add here type host and typo locality]. 



[Add synonymy here, in same style as foregoing entry.] 

 Specific diagnosis. — Fasciola (p. — ) [give page where generic diagnosis is printed]: 



[Add here specific diagnosis.] 

 Habitat. — [Give hosts and geographic distribution here.] 

 Type specimen. — [Give museum number of type specimen.] 



A list of hosts, together with the parasites found in them, i3 an 

 exceedingly useful adjunct to any paper dealing with parasites. 

 Several authors have published such lists, but most authors fail to 

 do so. If the plan of giving a compendium of hosts with every paper 

 were more generally adopted, the papers would be very much more 

 valuable. In indexing the hosts, especially in papers by certain 

 authors, we have met with considerable difficulty, for it is often nec- 

 essary to read carefully an entire article in order to avoid overlooking 

 the hosts. And even then it is, unfortunately, not exceptional 

 that the reader can not be certain that he is indexing correctly. 



