18 MEMOIRS OF THE CARNEGIE MUSEUM 



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

 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 Lacepede, 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). 



f21. Pimelodus insignis Schomburgk, p. 180, Rio Branco. 18 in. = Pimelodella cristata (Miiller 



pi. 6. & Troschel). 



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



pi. 7. 



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



pus pirinampu (Spix). 



24. Platystoma tigrinum Valenciennes, p. 185, Most rivers of Guiana. = Pseudoplatystoma 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. = Brachy platystoma 



vaillanti Valenciennes. 



27. Hypophthalmus dawalla Schomburgk, p. Rivers of Guiana. 2J^ft. = 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 Cuvier, p. 198, pi. 17. Rupununi, Rio Branco, Rio Negro. 15 ft. 410 



pounds = Arapaima gigas (Cuvier). 

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



pi. 10. = Osteogloss^l7n bicirrhosum Vandelli. 



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



figure. burgk). 



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



= ? 

 33. Chalceus labrosus Schomburgk, p. 212, pi. Rio Paduiri. 7 5J4 in. =? Brycon falcatus Miiller 



13. & Troschel. 



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

 213, pi. 13. (Schomburgk). 



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



36. Chalceus fasciatus Schomburgk, p. 215. Padauiri. 18 in. 



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



14. Cuvier. 



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

 ciated by Schomburgk. 



7 Padauiri? 



