FISHES. 



These are arranged according to the classification of Dr. 

 Giinther, whose great work " The British Museum Catalogue of 

 Fishes," has furnished almost all the material for our account 

 of the distribution of the class. 



In that work all existing fishes are arranged in six sub-classes 

 and thirteen orders. A study of the extraordinary Ceratodus 

 from Australia has induced Dr. Giinther to unite three of his 

 sub-classes ; but as his catalogue will long remain a handbook 

 for every student of fishes, it seems better to follow the arrange- 

 ment there given, indicating his later views by bracketing 

 together the groups he now thinks should be united. 



