FISHES. 



9 



which are endowed with swiftness in swimming, 

 the tail-fin is forked, each division being pointed, 

 as are also the pectorals ; while in those of slug- 

 gish habits, the caudal, as well as the pectorals, 

 is commonly short, even, or rounded. It is by 

 the force of the powerful strokes given obliquely 

 right and left upon the water by this fin that the 



^^ I ^j^X^"'-^ ^-^"^ 



HADDOCK. 



fish is urged onward in swift swimming; the 

 pectorals and ventrals seem little used to commu- 

 nicate motion, except it be in deliberate change 

 of place, for very short distances, or for turning ; 

 their chief use seems to be that of balancino- the 

 body. 



The bones are less dense and compact in their 

 structure than those of the preceding Classes; 



