98 CLASS XTV. 



Prochilodus AGASS., Pacu SPIX, MUELL. Palate smooth. A 

 double row of very thin and very small teeth in lips. 



Sp. Prochilodus argenteus AGASSIZ, Curimata MARCGR. Hist. Nat. Bras. 

 p. 156. 



Characinus LACEP. (in part). Palate smooth. Teeth in maxil- 

 lary bone and in lower jaw in a single row or none. Branchio- 

 stegous membrane with four rays, more rarely five. Abdomen not 

 serrate. 



Anodus SPIX, MUELL., Curimata Cuv. (in part), Curimatus YAL. 



Teeth none. Body elongate. 



Sp. Characinus cyprinoides LAC., Salmo cyprinoides L., Salmo edentatus 

 BLOCH, Ichth. Tab. 330; Surinam. 



Hemiodus MUELL. Teeth mobile, small, broad, with margin cre- 

 nate in upper jaw; lower jaw edentulous. Body elongate. 



Sp. Characinus unimaculatus, Salmo unimaculatus BLOCH, Ichth. Tab. 381, 

 fig. 3 ; Surinam, &c. 



Piabuca Cuv., VALENC. (Piabuca and Schizodon AGASS., MUELL.). 

 Teeth in intermaxillary bone and in lower jaw broad, serrate or 

 pectinate at the margin. Pharyngeal teeth uncinate. 



Sp. Characinus argentinus, Piabuca argentina Cuv., Salmo argentinus L., 

 BLOCH Ichth. Tab. 382, fig. i, a very long anal fin ; scales small. Chara- 

 cinus Schizodon, Schizodon fasciatus AGASS., SPIX Pise. BrasU. Tab. 36, 

 with short anal fin and large scales ; both from South America. 



Leporinus SPIX, AGASS., MUELL. Teeth in intermaxillary bone 

 and in lower jaw in a single row, small, procumbent, entire. Pha- 

 ryngeal teeth uncinate. 



Sp. Characinus Friderici LAC., Curimatus acutidens VALENC. formerly, Salmo 

 Friderici BLOCH, Ichth,. Tab. 378 ; Surinam. 



Citharinus Cuv. Teeth in intermaxillary bone and lower jaw 

 very minute, setaceous or subulate. 



a) With maxillary teeth numerous, setaceous ; with pharyngeal teeth 

 none. Dorsal fin placed over the space between the ventral fins and the 

 anal fin. Sp. Characinus Qeoffroyi, Serrasalmo citharinus GEOFFR., Descr. 

 de VEgypte, Poiss. PI. v. figs. 2, 3. Habit, in the Nile. 



6) With maxillary teeth few, subulate; with pharyngeal teeth flattened, 

 uncinate. Dorsal fin placed over the ventrals. (Chilodus MUELL.) Sp. 

 Characinus chilodus, Chilodus punctatus MUELL. and TROSCH. 1. 1. Tab. 57, 

 fig. i. Habit, in Guiana. 



