KEY TO THE PRINCIPAL FISHES 199 



bb. The pectoral fins are long, and 

 extend beyond the level of 

 the beginning of the anal fin 



Albacores (p. 148). 

 aa. The soft dorsal and anal fins form 

 high, pointed, sickle-shaped 

 lobes (at least in the adult) ; 

 the pectoral fins extend to or 

 nearly to the level of the 

 beginning of the anal fin 

 Yellow-finned Albacores (p. 151). 

 zz. The body is long and not very 

 robust ; there is no distinct 

 corselet in the ' ' shoulder ' ' 

 region ; the teeth are more or 

 less flattened 



Spanish Mackerels or 



King-fishes (p. 153). 



yy. The o spinous dorsal fin has about 



25 spines ; the teeth have fine, 



saw-like edges . . Peto (p. 154). 



11. The spinous dorsal fin is transformed into an 



adhesive disc, and is placed on the flat upper 



surface of the head . Remoras or 



Sucking-fishes (p. 173). 



hh. Both eyes are placed together on the same side 

 of the head ; the body is flattened from side 

 to side ; the eyed side is coloured and the blind 

 side is white . . . Halibuts (p. 178). 



gg. The snout and jaws are drawn out to form a 

 pointed " spear ". 

 c. The dorsal fin is rather low, and in adults consists 

 of a distinct lobe in front, which is well 

 separated from the hinder portion 



Spear-fishes or Marlins (p. 157). 

 cc. The dorsal fin is high, undivided and sail-like 



Sail-fishes (p. 161). 

 aa. There are no pelvic fins. 



d. The snout and upper jaw are drawn out to form a 

 long, flat, pointed " sword " 



Sword-fish or Broadbill (p. 165). 



dd. The snout is not drawn out to form a " sword ". 

 e. The body is long and eel-shaped ; the mouth is 

 wide ; the dorsal and anal fins are very long and 

 low. 



