Chap. VII. VAlfDEiE. 225 



pared with the great Tertebrate class of Fish, or still 

 more appropriately with tropical Homopterons insects, 

 which appesK to us as if they had been modelled 

 in the wildest caprice, but this no doubt is due to 

 our ignorance of their requirements and conditions 

 of life. 



11 ■< 



