30. piabuca. 343 



fcaimo gastropelecus, L. Gm. i. p. 1384 ; Block, taf. 97. fig. 3 ; Bl. Schn. 

 p. 418. 

 D. 10 A. 33-35. P. 11. V. 6. L. lat. 30-35. 

 A blackish band on each side of the tail. 

 Surinam ; Brazil. 



a. Skin : type of the species. Prom Gronow's Collection. — This spe- 



cimen is not well preserved, and therefore we are not certain 

 whether it is really identical with the species examined by 

 Valenciennes. It has only 28 anal rays, but some of them may 

 have been lost during the original process of preservation. 



b. Fine specimen. Essequibo. From Mr. Ehrhardt's Collection. 



2. Gastropelecus stellatus. 



? Gastropelecus securis, Filippi, in Gu£r. Rev. et Mag. Zool. 1853, p. 1G5. 

 Gastropelecus stellatus, Kner, Denksckr. Acad. Wiss. Wien, 1860, xviii. 

 p. 17. taf. 1. fig. 2. 



D. 13-14. A. 38-40. L. lat. 20. 

 Uniform silvery, without band along the side of the tail. (Kner.) 

 Rio Cujaba. 



3. Gastropelecus strigatus. 

 D. 9. A. 27. L. lat. 25. 



Thorax with four blackish bands radiating from toe middle of its 

 convex edge ; a blackish band along the base of the anal fin. 



The characters given will be sufficient to distinguish this species 

 from its congeners, but the state of the specimens is such as to pre- 

 vent me from giving a more detailed description. 



Hab. ? 



rt-6. One and a half inch long. Old Collection. 



30. PIABUCA. 



Piabuca, sp., Cuv. Regne Anim. 



Piabuca, Mull, fy Trosch. Hor. Ichth. i. p. 9. 



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

 behind the ventrals ; anal long, commencing below the dorsal. Body 

 elongate, covered with scales of moderate or of small size. Belly 

 compressed. Cleft of the mouth narrow ; intermaxillary and man- 

 dible with a single series of fixed, flat, serrated incisors ; palate 

 toothless. Gill-membranes united below the throat, not attached to 

 the isthmus. Intestinal tract with a single circumvolution. 



Brazils ; Surinam. 



1. Piabuca argentina, 



Piabuca, Marcgr. p. 170 



Trutta dentata, Koelreuter, Nov. Comm.Petrop. 1761, viii. p. 413. tab. 14. 



fig. 4. 

 Salmo argentinus, L. Syst. Nat. i. p. 511 ; Block, taf. 382. fig. 1 ; Bl. 



Schn. p. 403. 



