108 SILURID.E. 



is much stronger, serrated interiorly, two-fifths of the length of the 

 head. Brownish above, with numerous ovate black spots, as large 

 as, or larger than, the eyes ; sides with silvery patches ; dorsal and 

 caudal fins -with black dots. 

 Southern Brazil. 



a. Skin, .3 feet long. From a Collection made by Ch. Cumberland, 

 Esq., on the river Cipo, a tributary of the Eio dos VUhas which 

 falls into the San Francisco. Minas Geraes. 



7. Platystoma coruscans. 



Marcqr. Hist. Bras. Pise. p. 174 (lower figiu-e), copied bv Willughhy, 



tab. PI. 7. fig. 2. _ _ 

 Sorubim caparari, Spix, Pise. Bras. pi. 13. 

 Platystoma coruscans, Agass., in Sjnx, Pise. Bras. p. 26. 



D. 1/6. A. 10. P. 1/10. 



The upper jaw projects but little beyond the lower. The maxil- 

 lary barbels extend on to the ventrals. Yellowish above, with 

 numerous blackish ocelli, as large as, or smaller than, the eye ; head 

 immaculate ; dorsal and caudal fins with black dots. (Ag.) 



River San Francisco. 



8. Platystoma pardale. 

 Valenc. in iTOrhig. Voy. Amer. Merid.Poiss. pi. 4. fig. 2 ; Cuv. ^ Val. xv. 



^' *"" B. 16-17. D. 1/6. A. 13-14. P. 1/9. 



The upper jaw projects but little beyond the lower. Teeth as in 

 PI. tigrinum. The maxillary barbels extend to the prseoperculum, 

 the outer of the mandible a little further backwards. Brownish ; 

 body and fins covered with, numerous very small black spots. ( Val.) 



Buenos Ayres. 



9. Platystoma truncatum. 



Agass., in Spix, Pise. Bras. p. 27. tab. 13 a ; Hyrtl, Denkschr. Acad. 

 Wiss. Wien, 1859, xvi. p. 17. 



D. 1/6. A. 10. P. 1/10. Vert. 13/33 {Hyrtl). 



The upper jaw projects but little beyond the lower. The maxU- 

 lary barbel extends to the middle of the pectoral, the outer ones of 

 the mandible nearly to the gill-opening. Dorsal spine serrated 

 behind. Adipose fin very low. Uniform yellowish ; dorsal and cau- 

 dal fins with black dots. {Ag.) 



Itivers Japura and Solimoens. 



10. Platystoma vaillantii. 



Cta\ iS" Val. XV. p. 21. pi. 423; Kner, Sitzungsber. Wien. Acad. xxvi. 

 p. 397. 



B. 11. D. 1/6. A. 13. P. 1/10. Vert. 14/28. 



The upper jaw projects but little beyond the lower. The maxil- 



1 



