SALMONIDiE. SALMONIN^. 289 



mostly carinatedj and sometimes serrated. Rivers of 

 America. 



Cynodon Spix. Mouth enormously large^ oblique ; both 

 jaws armed with sharp^ distinct, and unequal teeth ; 

 first dorsal fin placed more or less backward, and op- 

 posite to the commencement of the anal, which is 

 very long ; ventral fin minute ; eyes close to the top 

 of the muzzle ; lower jaw longest. 

 C. gibbus. Spix and Agass. pi. 27. vulpinus. lb. 27. 



Characinus Artedi. f Body oblong-ovate ; head ob- 

 tuse ; upper jaw sinuated in "the middle on each side ; 

 the lower weaker, and both with the palate armed, 

 by pointed or tricuspidate teeth j belly smooth ; first 

 dorsal fin central ; scales large. 

 C. gibbosus. Gronov. pi. 1. fig. 4. Amazonicus. Spix, pi. 35. 



Anodus Spix. Body more slender ; resembling the last, 

 but the mouth is without teeth. 



A. elongatus. Sp. andAg. pi. 40. macrophthalmus, Bl. 380. 

 latior. lb. pi. 41. ( Salmo edentatus Bl.') 



* Lips fleshy. Prochilosus Agassiz. 

 P. argenteus. Spix, pi. 38. nigricans. lb. 39. 



Curimatus Cuv. General aspect of Anodus ; but the 



upper jaw is not sinuated, and in both there is a single 



row of teeth, either simple or bifid. 



C. fasciatus. Bl. 379. leporinus. Spix, pi. 37. 



Spixii Sw. Spix, pi. 36. (Leporinus 9-fasciatus S^i'a;. ) 



Serrasalmo Lac. Body short, broad, thick, somewhat 

 rhomboid ; head, mouth, and fins as in Characinus ; 

 but the under jaw is much thicker, the teeth stronger, 

 and the belly serrated, in front of which there is ge- 

 nerally a short spine ; first dorsal fin between the 

 ventral and anal ; the latter lengthened. 



S. aureus. Spix, pi. 29. ferox Sw. Spix, pi. 28. 



nigricans. lb. 30. bidens. lb. pi. 32. 



Tetragonopterus Artedi. Resembling Serrasalmo in all 



t Connected to Cynodon gibbus hy Characinus gibbosus Svi. 

 VOL. II. U 



