silueid^:. 



Synopsis of the Genera. 



I. Clariin^e. — Dorsal and anal fins much elongate; gill- membranes free from the isthmus. 



Dorsal fin single, formed entirely of soft rays 1. Clarices, Grron. 



Dorsal fin divided, the anterior portion formed of soft rays, the 



posterior adipose, supported by the prolonged neural spines . . 2. Heterobranchus, Geoff r. 



II. Silurim:. — Dorsal fin very short or absent ; adipose dorsal fin very small or absent ; anal 



fin much elongate ; gill-membranes free from the isthmus. 



Dorsal fin with a spine ; adipose fin present 3. Eutropius, M. & T. 



Dorsal fin with a spine ; no adipose fin 4. Scliilbe, Cuv. 



Dorsal fin without spine ; adipose fin present ; teeth absent ... 5. Siluranodon, Blkr. 



No dorsal fin ; adipose fin present 6. Physailia, Blgr. 



III. Bagrin^e. — Dorsal fin short; adipose fin present, or transformed into a second rayed fin ; 

 anal fin short ; gill-membranes free from the isthmus. 



A. Nasal barbel present ; teeth on the palate. 



Dorsal fin with 8 to 11 soft rays ; adipose fin very large .... 7. JBagrus, Cuv. 

 Dorsal fin with 5 or 6 soft rays ; adipose fin moderate or small . . 8. ChrysicJithys, Blkr. 

 Dorsal fin with 6 soft rays ; second dorsal fin rayed, with an anterior 



spine in the adult 9. Clarotes, Kner. 



B. Nasal barbel absent ; no teeth on the palate ; anterior nostril 



on the upper lip ; dorsal fin with 7 or 8 soft rays . . . 10. Auchenoglanis, Gthr. 



IV. DoRADiNiE. — Dorsal fin short ; a second dorsal fin, adipose or rayed ; anal short ; gill- 

 membranes grown to the isthmus. 



A. Second dorsal fin adipose, without rays. 



Mandibular barbels fringed or branched ; eye with a free border . 11. Synodontis, Cuv. 

 Mandibular barbels simple ; eye without free border ; a sucker- 

 like circular lip 12. Chiloglanis, Peters. 



B. Second dorsal fin rayed ; eye without free border. 

 Mandibular barbels branched; mouth toothed ; body naked ; posterior 



nostril verv large 13. Mocliocus, Joannis. 



Mandibular barbels simple ; mouth toothless ; body with scutes ; 



caudal peduncle extremely slender 14. Andersonia, Blgr. 



Y. Malopterurin^e. — No rayed dorsal fin ; adipose fin present ; 



anal short; gill-membranes grown to the isthmus .... 15. Malopterurus, Lacep. 



