20S JOURNAL OF CONCHOLOGV, VOL. II, NO. 7, JULY, I905. 



are identical with the generic name. Examples : Trutta trutta, Aptis 

 apus apus. 



Art. 34. — A generic name is to be rejected as a homonym when 

 it has previously been used for some other genus ^ of animals. 

 Example : Trichina Owen, 1835, nematode, is rejected as homonym 

 of Trichina Meigen, 1830, insect. 



Art. 35. — A specific name is to be rejected as a homonym when 

 it has previously been used for some other species or subspecies of 

 the same genus. Example: Tcenia ovilla Rivolta, 1878 (n. sp.) is 

 rejected as homonym of T. ovilla Gmelin, 1790. 



When in consequence of the union of two genera, two different 

 animals having the same specific or subspecific name are brought 

 into one genus, the more recent specific or subspecific name is to be 

 rejected as a homonym. 



Art. 36. — Rejected homonyms" can never again be used. Re- 

 jected synonyms can again be used in case of the restoration of 

 erroneously suppressed groups. Example : Tienia Giardi Moniez, 

 1879, was suppressed as a synonym of Tenia ovilla Rivolta, 1878 : 

 later it was discovered that Tcetiia ovilla was preoccupied ( Tcenia 

 ovilla Gmelin, 1790). Tefiia ovilla, 1878, is suppressed as a 

 homonym, and can never again be used ; it was still-born, and can 

 not be brought to life, even when the species is placed in another 

 genus {Thysa7tosonia). Tcenia Giardi, 1879, which was suppressed 

 as a synonym, becomes valid upon the suppression of the homonym 

 Tcenia ovilla Rivolta, 1878. 



1 Besides the special journals and special nomenclators of various groups, authors will find 

 the following publications very valuable in determining whether any given subgeneric, generic 

 or supergeneric name is preoccupied, and if authors will consult these works before publishing 

 new names, considerable confusion and later change of names will be avoided. 



C. D. Sherborn, Index anhnalhon sive index nominum qua ah A.D. lyjS gencribas 

 et speciebus ani)naUum iniposita sunt. Societatibus entditorum admvantibxis a Carolo Davis 

 Sherborn confecUis. Sectio I a. kalendis januariis, IJSS lesgue ad fineni decetiibris, 1800. 

 Cantabiigiae, 1902, 8"- 



S. H. ScuDDF.R, Notnenclator zoologicus. An alphabetical list of all generic navies that 

 Slave been employed by naturalists for recent and fossil animals from the earliest times to 

 the close of the year rSyg. In 2 parts : i. Supplemental list. 2, Universal index. By Samuel 

 H. ScuDDER. Washington, 1882, S"- 



C. O. Waterhouse, Index zoologicus. An alphabetical list of names of genera and 

 subgenera proposed for use in zoology as recorded in the Zoological Record, iSSo-iqoo, together 

 ivith other nariies not included in tlie Nonieticlator zoologicus of S. H. Scudder. Compiled . . 

 by Charles Owen Waterhouse and edited by David Sharp, London, 1902, 8" 



The Zoological Record, XXXVIII. [et seqq.]. Being 7-ecords of zoological literature 

 relating chiefly to the year igoi [et seqq.]. London, 1002 [et seqq.]., S"- Index to names of 

 new genera and subgenera. 



Register zum zoologischen Anzeiger. Herausgegeben von J. V. Carus. Jahrgang t-io 

 (1878-87), 11-15(1888-92), i6-2o (1893-97), 21-25(1898-1902). Leipzig, 1889, 1893, 1899, 1903, 8°- 



[.\ card list of names of genera and species published since 1900 ii being compiled by 

 Dr. Field of the Concilium Bibliographicum, Zurich. — W.E.H.] 



2 A homonym is one and the same name for two or more different things. Syiio;iyms are 

 different names for one and tl^e same thing. 



