LARVAL FISHES : THEIR METAMORPHOSES. 135 



transformations to be found amongst the fishes, 

 though in these two particular instances we have 



FIG. 13. Three stages in the development of the Sword fish 

 (after Giinther). 



the most interesting of them all. The signifi- 

 cance of transformations is in some cases more 

 or less obvious and intelligible ; but as often as 



