18 MEMOIRS OF THE CARNEGIE MUSEUM 



*15. Phradocephalus hemilopterus Agassiz, All rivers of Guiana. 4 ft. = Phradocephalus 



p. 169, figure. hemiliopterus (Bloch & Schneider). 



16. Arius oncina Schomburgk, p. 173, pi. 4. Rio Padauiri. 10 in. = ? 



17. Arius obesus Schomburgk, p. 174. Rio Branco. 8 in. = ? 



*18. Pimelodus (Bagrus) maculatus Lacdpede, Most of the rivers. 12 in. = Pimelodus clarias 



p. 175, figure. (Bloch). 



*19. ? ? ? p. 176. Demerara and Essequibo. 18-20 in. 



*20. Pimelodus arekaima Schomburgk, p. 178, Upper Essequibo and Rio Branco. 2 ft. 3 in. = 



pi. 5. Rhamdia arekaima (Schomburgk). 



t21. Pimelodus insignis Schomburgk, p. 180, Rio Branco. 18 in. = Pimelodella crisiata (MiiWer 



pi. 6. & Troschel). 



22. Pimelodus notatus Schomburgk, p. 181, Rio Branco. 3 feet. 



pi. 7. 



*2S Pimelodus pirinampu Spix, p. 183. Rivers of Guiana. 3 feet or more. = Piniram- 



pus pirinampu (Spix). 



24. Plalystoma tigrinum Valenciennes, p. 185, Most rivers of Guiana. = Pseudoplaty stoma fas- 



pi. 8. datum (Linnaeus). 



25. Platystoma planiceps Agassiz, p. 187. Rio Branco. 



26. Platystoma vaillanti Valenciennes,' p. 188. Guiana. To 2 ft. 3 in. = Brachyplatystoma 



vaillanti Valenciennes. 



27. Hypophthalmus dawalla Schomburgk, p. Rivers of Guiana. 2}^^^. = Ageneiosusbrevifilis 



191, pi. 9. (Cuv. & Val.). 



*28. Lau-Lau, p. 193, figure. Rivers of Guiana. 10-12 ft. 200 lbs. = Platy- 

 stoma vaillanti Valenciennes. 



*29. Sudis gigas Cuvicr, p. 198, pi. 17. Rupununi, Rio Branco, Rio Negro. 15 ft. 410 



pounds = Arapaima gigas (Cuvier). 



*30. Osteoglossum arowana Schomburgk, p. 205, Rupununi, Essequibo, Rio Branco, Rio Negro. 



pi. 10. = Osteoglossum bicirrhosum Vandelli. 

 31. Chalceus rotundatus Schomburgk, p. 209, Padauiri. 6-7 in = Chalcinusrotundatus(Schom- 

 &guTe. burgk). 

 *32. Chalceus tcsniatus Schomburgk, p. 210. Essequibo, Rio Negro, Rio Branco. 15-18 in. 



= ? 



33. Chalceus labrosus Schomburgk, p. 212, pi. Rio Paduiri.' S^^ in. ='? Bry con falcatus MuWei 



13. & Troschel. 



*34. Chalceus nigrotceniatus Schomburgk, p. Loc. ? 14-16 in. = Leporinus nigrotxniatus 



213, pi. 13. (Schomburgk). 



35. Chalceus latus Schomburgk, p. 214. Padauiri, tributary of the Rio Negro. 4 in. 



36. C/iaZcetts/asct'a/MS Schomburgk, p. 215. Padauiri. 18 in. 



*37. Chalceus macrolepidotus Cuvier, p. 216, pi. Essequibo. 15 in. = Chalceus macrolepidotus 



14. Cuvier. 



' This species is given on the authority of Valenciennes. Its identity with the Lau-Iau was not appre- 

 ciated by Schomburgk. 

 ' Padauiri? 



