84 FISHES. 



20. PERCA. Jaws unequal : teeth sharp, incurved: gill' 

 membrane 7 -rayed ; the covers scaly, of 3 pieces, the 

 upper-piece serrate: lateral-line arched with the 

 back: scales mostly hard and rough : dorsal-fin spi- 

 nous on the fore-part : vent nearer the head than the 

 tail. 



21. SCOMBER. Head compressed, smooth: body oblong 

 smooth, sometimes carinate by the lateral line: gill- 

 membrane 7-rayed : between the dorsal-Jin and tail arc 

 mostly several spurious Jins. 



9%, GASTEROSTEUS. Jaws armed with minute teeth . 

 gill-membrane 3, 6, or 7-rayed; the cover of 2 pieces, 

 rounded and striate; body somewhat lengthened: 

 lateral-line straight : dorsal*fin single, with distinct 

 spines between it and the head : ventral-fins spinous : 

 belly carinate or shielded on the iides, and bony 

 beneath. 



23. MULLUS. Head compressed, sloping, scaly: eyes 

 oblong, approximate, vertical, furnished with a nicti- 

 tant membrane : nostrils double, minute : palate armed 

 with small teeth : mouth bearded : gill~membrane 

 3-rayed; the ; cpvers of 3 pieces, very finely striate : 

 body clothed with large deciduous scales. 



21. TRIGLA, Head large, mailed, marked with rough 

 lines: eyes large, round, vertical: palate and jatrs 

 armed with sharp teeth: gill-membrane 7 -rayed; 

 the cover of a single radiate spinous piece : back 

 straight, with a longitudinal spinous groove each 

 side : pectoral-fins with generally finger* shaped pro-* 

 cesses placed before them, 



ORDER IV. ABDOMINALES, 



y tcith the ventral fins placed behind the pectoral, 



25. COBITIS. Head small, oblong, naked : month gene- 

 rally bearded : eyes seated in the upj>er-part of the 

 head : gill-membrane 4-6-rayed : the covers of one 

 piece, closing beneath: body of nearly equal thick- 

 ness from head to tail, covered with mucus and small 

 . thin easily deciduous scales : back straight, with % 

 single fin : vent nearer the tail : tail rounded. 



$6. SALMO. Head smooth, compressed: tongue cartila- 

 ginous, moveablc : teeth in the jaws and on thetongue: 

 gill-membrane 4-12-raycd; the cover of 3 'pieces: 

 body compressed : back convex, furnished on the 

 hind-part with a fleshy fin without rays : 

 straight, nearer the back, 





