CHAPTER 4* 



Provisions for Exceptions to the Rules and 



for the Interpretation and 



Modification of Rules 



PROVISION 1 



Modification and amendmeiit of Code. This Code can be 

 amended only by action of the International Committee on Bacterio- 

 logical Nomenclature and approval of a plenary session of an In- 

 ternational Congress for Microbiology convened by the International 

 Association of Microbiological Societies. 



PROVISION 2 



Lists of nomina co?iser~vanda. To avoid disadvantageous changes 

 in the nomenclature of the genera by the strict application of the 

 Rules of Nomenclature, the Rules provide for a list of names which 

 must be retained as exceptions (nomina conservanda) . 



Note 1. This list of conserved names will remain permanently 

 open for additions. Any proposal of an additional name must be 

 accompanied by a detailed statement of the case for and against its 

 conservation. Such proposals must be submitted to the Judicial 

 Commission (see Provision 4) for study and appropriate action. 



Note 2. When a name proposed for conservation has been pro- 

 visionally approved by the Judicial Commission, bacteriologists are 

 authorized to retain it pending the decision of the next International 

 Congress for Microbiology. 



Note 3. A conserved name is conserved against all other names 

 for the taxon, whether these are cited in the corresponding list of 

 rejected names or not, so long as the taxon concerned is not united 

 with another taxon bearing a legitimate name. In the event of 

 union or reunion with another taxon, the earlier of the two com- 

 peting names is adopted in accordance with Rules 19, 20 and 21. 



Note 4. A conserved name is conserved against all earlier homo- 

 nyms. 



* No annotations are included in Chapter 4; the entire chapter is a part of the of- 

 ficial Code. 



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