7. rRocniLODus. 295 



and two-thirds. Silvery, each scale with a narrow blackish base ; the 

 hind part of the dorsal fin with blackish dots ; caudal fin uniform. 

 Brazil. 



a-b. Skins (20 inches long). Cipo River. Presented by Ch. Cum- 

 berland, Esq. 



4. Prochilodus nigricans. 



? Procliilodus nigi-icaus, Arjass. in Spix, Pi.sc. Bras. p. G4. taf. 30. 

 Prochilodus rubra-ta3uiatus, Schotnb. Fish. Guian. i. p. 258. pi. 28. 

 Pacu nigricans, 3IHII. Sf Trosch. Hor. Ichth. iii. taf. 1. figs. 4 & 4 a. 

 Prochilodus uigi-icans, Cnv. Sf Viil. xxii. p. 80 ; Casteln. Anim. Amer. 

 Sud, Poiss. p. 63. pi. 31, fig. 3 (bad). 



D. 11. A. 10. V. 9. L. lat. 43. L. transv. ^^. 



The height of the body is contained twice and two-thirds in the 

 total length (without caudal), the length of the head four times. 

 Silvery, each scale darker at the base ; dorsal and caudal fins with 

 blackish dots, which are arranged in irregular transverse series. 



lirazil ; Guiana. 



a. Fine specimen. Essequibo River. From Mr. Ehrhardt's Collection. 



5. Prochilodus oHgolepis. 



Prochilodus nigricans, Kncr, Denksc/u: Wien. Acad. 1859, xvii. p. 146 

 (not synou.). 



L. lat. 3G-38 ; otherwise similar to P. nigricans. 

 Brazil. 



The smaller number of scales in the lateral line shows that the 

 specimens named P. nigricans in the Vienna Collection belong to a 

 difierent species. 



6. Prochilodus reticulatus. 

 Cuv. ^- Val. xxii. p. 92 ; Ktier, Denkschr. Wien. Acad, 1859, xvii. p. 147. 

 D. 11. A. 11. V. 9. L. lat. 44. 



The height of the body is contained four times and one-fourth in 

 the total length ('ndtli the caudal), the length of the head five times 

 and one-third. The margin of each scale rougli, as if covered with 

 small scales. The pectorals terminate at a considerable distance 

 from the ventrals. Each scale with a darker margin; dorsal fin 

 ■with dots. 



Brazil. Lake of Maracaibo. 



7. Prochilodus Uneatus. 



Paca liueatus, Valenc. in d'Orh. Voy. Amer. Merid. Poiss. pi. 8. fig. 3. 

 Prochilodus lincatus, Cuv. 4- V<d. xxii. p. 84. 



D. 12. A. 11. L. lat. 50. 



The height of the body is less than one-third of the total length 



