viii 



PREFACE TO THIRD EDITIOX 



The lists of the lepidoptera, coleoptera, land and fresh- 

 water molluscs, and of flowering plants and mosses,, 

 supposed to be peculiar to the British Isles, have also' 

 been corrected and brought up to date by the best 

 authorities on these groups, who have kindly given me 

 invaluable assistance in this very difficult portion of my 

 work. The assistance thus afforded me is in every case 

 duly acknowledged in the several chapters here referred to. 



The remaining parts of the work have also been sub- 

 jected to careful revision, and the various errors that have 

 been pointed out to me or have been detected by myself 

 have been corrected. 



The much more extensive lists of species in many of 

 the islands have somewhat increased the size of the work, 

 but in order to avoid the inconvenience of repaging the 

 latter half of the volume, and thus rendering all references 

 to this part of it useless for the present edition, the 

 numbers of the pages remain, so far as possible, un- 

 altered, the additional matter having the letters «, h, c, 

 &c., appended to the number of the page where the over- 

 running begins. This I venture to think will be a great 

 convenience to my readers. 



