GENUS CATOStOMUS. 95 



of the back dark blue, base of the scales brown; sides 

 whitish, with yellow reflections; opercula yellowish; head 

 reddish brown; the lateral line rises at the nape of the neck, 

 descends along the gill-cover, and thence to the tail in a 

 line with the centre of the eye. Found in the river Dela- 

 ware. 



P. 18.— D. 16.— V. 9.— A. 9,— C. 18| rays. 



5. C. aureolus. Anal fin long, pointed, and passing 

 considerably beyond the base of the caudal fin, which is 

 forked, with pointed lobes, the inferior of which is the 

 largest; abdominal fin truncated. 



Body subcylindric, elevated at the nape: head quad- 

 rangular, gibbous above the eye, almost as high as long; 

 the rays of the anal fin are very strong and large; scales 

 rhomboidal, equal; body of a beautiful orange colour, 

 which is deepest on the back, the base of the scales dark 

 red; the sides are heightened with golden reflections; pecto- 

 ral, ventral and anal fins of a fine red orange, caudal fin 

 of a deep carmine colour — the dorsal fin is paler than the 

 rest; the lateral line is nearly straight, and commences in a 

 line with the eye. Length of individual described sixteen 

 inches, its depth three inches, and its thickness two inches 

 and a half. 



P. 18.— D. 14.— V. 9.— A. 8.— C. 18 rays. 



This beautiful species I discovered near Buffalo, on 

 Lake Erie. 



6. C. communis* Dorsal fin quadrangular; cwof/^/i 

 narrow, and extends as far as the base of the caudal fin^ 

 which is somewhat lunated, with rounded lobes, the infe- 

 rior lobe rather the longest; eyes situated nearer the poste- 

 rior part of tlie opercula than the tip of the snouti mouth 

 very large. 



