86 CLASS XIV. 



Brontes Yalenc. 



Distinguished from the preceding genus by the absence of a second dorsal 

 fin. Sp. Brontes prenadlUa Valenc. 1. 1. PI. 445 ; this fish also lives at 

 great heights in brooks that flow from the Cotopaxi, and is also, as is re- 

 ported, ejected by the Volcano. 



Astroble2ms Humb., Valenc. Dorsal fin single, I'adiate. Ventral 

 fins none. 



Sp. Astrohlepits Orixalvii Humb., Eecuell d'Observ. i. pp. 19, 20. 



Trachelyopterus Valenc. 



Auchenipterus Valenc. 



Bagrus Cuv. (with the addition of some species of Fhnelodus 

 ejusd.). Body naked. Teeth setaceous, crowded in jaws; palatine 

 teeth in some arranged in the vomer in a parallel row, similar to the 

 maxillary, in others at the sides of mouth in the bones of palate 

 and the pterygoids, sometimes globose. Branchiostegous membrane 

 with rays various in number, mostly 6 — 10. Dorsal fins two, the 

 second adipose. Cirri 2 — 8. 



Arms Valenc. Palatine teeth arranged in two lateral groups. 

 Branchiostegous membrane with 5 — 8 rays. 



Sp. Arius militaris Valenc, Silurus militaris L.? Cuv. et Valenc. Hist, 

 des Poiss. xv. PI. 430. Two stiff bony cirri at the upper jaw. Bleekeb 

 has discovered some new species of this division which he unites under the 

 generic name of Osteogeneiosus. In the remaining species the cirri are mem- 

 branous and flexible ; many of these species occur in America, others iu the 

 East Indies, as Arius rita Valenc. 1. 1. PL 429. 



Bagrus Cuv. Palatine teeth crowded in a continuous parallel 

 row behind the teeth of itpper jaw. 



Silundia Valenc. Two small cirri. Adipose fin small, anal long. 

 Branchiostegous membrane with 12 rays. 



Pangasius Valenc. Cirri 4. Branchiostegous membrane with 10 rays. 



Galeichlhys Valenc. Head rotundate. Branchiostegous membrane with 

 6 rays. Cirri 6 or 4. 



Platystoma Agassiz. Snout depressed. Branchiostegous membrane with 

 16 or 17 rays. Cin-i 6. 



Phractoceplialus Agass. Branchiostegous membrane with 9 rays. Cirri 6. 

 Osseous rays imperfect in the upper margin of adipose fin. 



Bagrus Valenc. Branchiostegous membrane with 8 — 10 rays. Cirri 6 

 or 8. Adipose fin without rays. 



