318 CHARACINID^. 



/3. The height of the body is less than one-half of the total length. 



* The dorsal fin commences distinctly behind the origin of the 

 ventral, p. 321. 



** The origin of the dorsal and ventral fins are nearly in the same 

 vertical, p. 328. 



b. Cleft of the mouth rather wide ; maxillary without teeth along its 



edge, long and narrow, extending to, or nearly to, below the centre 

 of the eye. Dorsal fin above the ventral : Creatochanes, m., p. 329. 



c. Cleft of the mouth of moderate width; the entire edge of the 



maxillary denticulated : Hemibrycm, m., p. 330. 



A. Anal rays forty or more. 

 a. Maxillary with only a few rudimentary teeth near its articulation. 



1. Tetragonopterus spilurus. 

 Cuv. fy Val. xxii. p. 156. 



D. 11. A. 48. 



Ventral profile much arched ; snout pointed. A silvery band along 

 the side of the body. ( Val.) 

 Surinam. 



2. Tetragonopterus argenteus. 

 Cuv. Mem. Mus. iv. p. 455 ; Cuv. $ Val. xxii. p. 132. 

 B. 4. D. 11. A. 40. V. 8. L. lat. 30. 



The height of the body is not less than one-half of the total length 

 (without caudal), the length of the head about one-fourth. Upper 

 profile of the head concave ; diameter of the eye equal to the width 

 of the interorbital space, and one-half of the length of the head. 

 The pectoral extends beyond the root of the ventrals. Maxillary 

 with only a few teeth near its articulation. Two dark cross-bands 

 descend from before the dorsal, one to the gill-opening, the other 

 towards the middle of the pectoral fin. A black spot on the root of 

 the caudal. 



Bahia? 



3. Tetragonopterus rufipes. 



Valenc. in a" Orb. Voy. Amer. Merid. Poiss. pi. 11. fig. 1 ; Cuv. # Val. 

 xxii. p. 136. 



D. 11. A. 40. V. 8. L. lat. 30. 



The height of the body is three-fifths of the total length (without 

 caudal), the length of the head somewhat more than a fourth. Upper 

 profile concave ; eye very large. Maxillary with only a few teeth 

 near its articulation. Body without dark cross-bands ; ventral and 

 anal fins orange-red. ( Val.) 



Buenos Ayres. 



