3IO APPENDIX A. 



[9. A. If however the original types of these genera were heterotypical 

 each of the genera is valid for its own type. 

 Durrant= Br. Assn. Rule § 7. 



9. B. If types heterotypical in structure have been assigned to each ge7ius 

 {there being no evidence to disprove the possibility of their having been the 

 original types) the genera should be accepted in their restricted sense. 



Durratit. 



I have ventured to add these two paragraphs in the hope that paragraph 

 9 may be more fully discussed.] Durrani. 



REPLIES. 



74. Hampson (Sir G. F.). 12 Sept. 1896. 



" Theoretically the type of a genus is the species from which 

 the author originally described the genus ; it therefore follows that 

 no restrictions of the author subsequent to the creation of the genus, 

 much less of any subsequent author, can in any way affect the type 

 of the genus, and the modern system of taking out from the genus 

 all the species for which other genera have been created by subse- 

 quent authors, till in many cases a species is left as the type, which 

 came near the end of the original list of species and had often 

 never been seen by the author, but had been included from the 

 superficial resemblance of some figure of Cramer's, etc., is a rediictio 

 ad absurdnm. In cases where no type is indicated, the species 

 which heads the list is to be taken as the type if its characters 

 agree with those given for the genus, and it is a well-known species 

 such as the author is likely to have described the genus from. 

 Guenee, for instance, often says that certain species which come 

 at the head of his list do not quite agree with the body of his genus, 

 and this would be sufficient reason for rejecting them as the type." 



[Vide Hampson 84. Durrani.^ 



75. Walsingham (Lord). 



" In arriving at the conclusions given below under separate 

 headings, I rely solely upon the absolute application of the Law of 

 Priority, which is of equal importance in governing the fixation of 

 types by elimination, by restriction, or by citation, as well as in 

 relation to original nomenclature." 



[Vide Walsingham 85, 88. Durrani.'] 



76. Mevrick (E.). 



" To fix the type of a genus I use the following rules : 



(a) The t}-pe must be one of the species originall}' included 

 under the ^enus. 



