SYSTEMATIC INDEX. XIX 



ORDER III. THORACIC FISH. 



These have bony gills; and the ventral fins situated directly 

 under the thorax. 



6. Sucking-fish tribe. Have the back of the head flat,. naked, 



and furrowed across .page 238 



Common Sucking-fish, or Reinora ib. 



7. Bull-head tribe. Have the head broader than the body ; 



and the body without scales .". . 239 



Father Lasher 239 | Miller's Thumb 240 



8. Doree tribe. Have the upper lip arched by a transverse 



membrane; and the body compressed, thin, and shining . 241 



John Dore'e 241 | Opah, or King-fish 242 



9. Flat-fish tribe. Have both their eyes on one side of the 



head ; the body flat, the upper part convex and coloured, 

 and the lower part flat and pale 242 



Dab 244 



Sole 245 



Holibut 243 



Flounder ib. 



Plaise 244 



10. Perch tribe. Have the covers of the gills three-leaved, 

 the upper ones serrate at the edges. The fins are spi- 

 nous, and the scales are hard and rough 240 



Common Perch 246 I Basse 247 



Kufte 247J 



11. Stickleback tribe. Have the tail with a ridge at the sides, 



and distinct prickles in front of the dorsal fin 248 



Three-spined Stickleback . . 248 | Pilot-fish 249 



12. Mackerel tribe. Have the tail with a ridge at the sides, 

 and several small and distinct fins betwixt the dorsal fin 

 and the tail .250 



Common Mackerel 250 I Scad 252 



Thunny, or Albicore 251 | 



13. Surmullet tribe. Have the body and gill-covers with large 

 and loose scales 253 



Red Surmullet ib. 



14. Gurnard tribe. Have the head large, angular, and bony ; 

 and two or more distinct appendages near the pectoral 

 fins 253 



Gray Gurnard 253 | Flying Gurnard 254 



