34. sALMijfus. 349 



33. HYSTRICODON. 



Exodon*, Miill. ^- Trosch. Hor. Ichth. i. p. 31. 



Dorsal fin placed in the middle of the length of the body, above 

 the ventrals ; anal rather elongate, commencing behind the dorsal 

 fin. Body oblong, covered with scales of moderate size ; lateral Une 

 complete. Belly rounded. Cleft of the mouth rather wide ; teeth 

 conical, in a double series in the intermaxillary, maxillary, and man- 

 dible ; those of the outer series largest, irregular, divergent ; palate 

 toothless. Nostrils close together. GUI-openings wide. 



Guianas, Brazil. 



1. Hystricodon paradoxus. 



Exodon paradoxus, Mull. ^- Trosch. I. c. taf. 4. fig. 1 ; Kner, Denk-ichr. 



Acad. Wiss. Wien, 18G0, xviii. p. 46. 

 EpicjTtus exodon, Cia\ ^- Val. xxii. p. 40. 

 paradoxus, Casteln. Anhu. Amer. Sud, Poiss. p. 60. 



B. 4. D. 10-11. A. 20-22. V. 8-9. L. lat. 37. 



The height of the body is rather more than the length of the head, 

 and one-third of the total (without caudal). Intermaxillary with a 

 pair of short conical teeth in front, pointing forwards ; caudal fin 

 deeply forked. Body with a silvery band above the lateral Une, and 

 with two large blackish spots, one on the side of the trunk, and the 

 other at the root of the caudal fin. 



Brazil, Guiana. 



34. SALMINUS. 



Salniinus, Mull. Sf Trosch.f Hor. Ichth. i. p. 16. 



Dorsal fin placed in the middle of the length of the body, behind 

 the ventrals ; anal long. Body oblong, covered with scales of mode- 

 rate size ; bellj- rounded. Cleft of the mouth wide, maxillary elon- 

 gate. Teeth conical : intermaxillary and mandible with a double 

 series, the teeth in the outer series being much larger than those in 

 the inner ; maxillary toothed along its entire length. Nostrils close 

 together. Gill-opening very wide, the gill- membranes being free and 

 separate. 



Brazils. 



1. Salminus hilarii. 



Cuv. i^'- Val. xxii. p. 64 ; Casteln. Anivi. Artier. Sud, Poiss. p. GO. pi. 31. 

 fig. 1. 



D. 11. A. 2.5. V. 8. L. lat. 69. L. transv. 10/8. 

 The length of the head is nearly equal to the height of the body, 

 and somewhat more than one-fourth of the total (^vithout caudal) ; 

 maxillary with about 37 teeth ; operculum two-fifths as long as high. 

 The origin of the dorsal fin is a little nearer to the root of the caudal 

 than to the extremity of the snout. Caudal fin with the middle rays 



* Preoccupied. 



t This genus was first characterized by Miiller and Troachel. 



