££:0* 



^^lUS::': 



-^.-. I 



I. THE ADULT SNAKE-FISH [Polyptevus). Photo by A. Rudland, 



2. ADULT GREY GURNARD. 3, 4. YOUNG OF THE SAME. 



The Shake-fish breathes by internal gills, and has the back fin made up o£ 

 many finlets, and a short tail-fin. Tlie breast-fins are used simply as balancers. 

 In the larval stage the fins have a very different form, breathing is performed 

 by external gills, and the breast-fiiis are used as supports. Note the very 

 different form of the back-fin and tail, and the enormous breast-fin of the 

 young Grey Gurnand. 

 228] 



