PLATE 54 
PLATE XXXIX. 
PERCA CERNUA. 
RUFFE. 
THORACICI. 
GENERIC CIIARACTEU. 
Jaws unequal. Teeth acute, and incurvated. Gill covers of three 
plates, scaly ; the upper plate serrated. Seven rays in the gill mem- 
brane. Lateral line arched with the back, scales hard and rough. 
Fins spinous. 
SPECIFIC CHARACTER. 
Dorsal fin with twenty-seven rays ; the first fifteen spinous. 
Perca Cernua : pinnre dorsalis radlls 21, spinis 15. Linii. Fn. 
Suec. 335. Gmel. Linn. Syst. Nat. 1320. 
sp. 30. 
IluFFE. Penn. Brit. 2ool. T. 3. n. 114. 
This kind of Perch proves to he a general inhabitant of all the 
countries in the north of Europe : its haunts are chiefly clear streams, 
lakes, and rivers, where it delights in the deepest waters ; and pre- 
ferring cold to warm situations, appears to be most abundant in 
those of mountainous places, Mr. Pennant observes, that it is 
t 
