PRINCIPLES, CANONS, AND RECOMMENDATIONS. 67 



14. Of the Description of Zoological Objects. 



RECOMMENDATION V. When naming a new species or sub- 

 species, always give a diagnosis, as short as possible, but still 

 containing all the essential features by which the species or 

 subspecies may be distinguished from the other known mem- 

 bers of the genus to which it is referred. Base the diagnosis 

 on the type specimen, and indicate the museum where the type 

 is deposited, and the catalogue number by which it may be iden- 

 tified. Give a comparison with the nearest allied forms, and 

 tabulate, if possible, the characters of the new form in a ' key ' 

 to the genus, or a section of it. 



RECOMMENDATION VI. When establishing a new genus, al- 

 ways mention at least the family to which it is considered to 

 belong, and a single typical species ; give then the diagnostic 

 characters by which the members of the genus may be distin- 

 guished from those of the allied genera. 



15. Of the Bibliography of Names. 



RECOMMENDATION VII. In preparing tables of bibliographi- 

 cal references in works of a revisionary or monographic charac- 

 ter, all published works which throw light upon the history of 

 the organisms in question are subject to citation. 



REMARKS. The object of such citation is twofold ; (i) to afford a 

 guide to the literature of the subject ; (2) to show what name or combi- 

 nation of names is tenable for the organism under consideration, and the 

 authorities for such names. 



RECOMMENDATION VIII. Citations are to be made in chrono- 

 logical order, the earliest name given to the organism standing 

 first, and the other designations following in due sequence ; 

 then under each designation are to be arranged, also in chrono- 

 logical order, the several works or papers which treat of the 

 organism under such designation. The date of publication is 

 always to be made a part of the citation. 



