388 The American Naturalist. [May, 



to whatever sub-division he may select and this application 

 cannot be changed subsequently. 



29. The division of species is subject to the two preceding 

 rules. 



30. If in consequence of the division of a genus, a species is 

 put into one of the divisions of the primary genus, the name 

 of the author of the species must follow the specific name. 

 Several notations are in use which we insert below in th.- 

 order of their merits, taking as an illustration the old Hirudo 

 muricata Linne, 1761, placed in the new genus Pontobdella by 

 Leach in 1815: 



1. Pontobdella muricata Linne. 



2. P. muricata (Linne). 



3. P. muricata Linne (sub Hirudo. 



4. P. muricata (Linne) Leach. 



5. P. muricata Leach ex Linne. 



31. A genus formed by consolidation of several old ones 

 takes the name of the oldest of them. 



32. This rule applies when several species are consolidated 



33. When, in consequence of consolidation of two genera, 

 two organisms, having the same specific name, are found in the 

 same genus, the most recent receives a new name. 



VI. Family Names. ' 



34. Family names are formed by adding the ending idse to 

 the radical of the genus serving as type. The sub-divisions of 

 the family are named by adding the ending h\ie to the name 

 of the genus serving as type. 



VII. Law of Priority. 



35. The name originally given to each genus and species B 

 permanent, provided : 



m (a) The name has been announced in a publication in wh«* 



(b) The anther has properly ', ppli,!. l' the' rules of binary 

 nomenclature.— K. M. Mcsitm iVin.-.-ton \W Jersey, > T ° r * 

 14th, 1891. 



