SYNOPSIS OF THE ARRANGEMENT OP FISHES. 189 



HoPLisosiA. Head and body compresssed ; mouth terminal, 

 Cataphractus. Eyes very small, vertical ; head very broad. 

 SiuRisoiiA. Body long, slender ; snout very long. 



2. Sub-family Pimelodin^. — Body more or less naked ; 



head compressed, moderate ; the mouth terminal ; dorsal 

 fins two ; anal fin short. * 



Synodontis. Head and body compressed; the latter short 

 and broad ; cirri pectinate. 



MrsTUs. Sides of the body with spined bony plates. 



Pi:mjelodus. Body naked ; cirri simple ; anal fin short, 



Breviceps. Head short, depressed ; anal fin rather lengthened. 



Cyclopium. Head depressed ; eyes very small, vertical. 



3. Sub-family Silurin^. — Tail and anal fin very long. 



Ageniosus. Dorsal fins two ; no cirri. 



Silonia. Eyes very large ; body compressed ; carinated. 

 Ageniosus. Maxillaries resembling horns. 



Pachypterus. Dorsal fins two ; cirri long. 



Hypophthalmus. Eyes very distant. 

 Pachypterus. Ventral fins very long. 



SiLURUs Linn. Dorsal fin one, very short. 



Clupisoma. Head compressed ; eyes large. 

 Callichrus. Dorsal near the head ; caudal forked. 

 Malapterurus. Dorsal near the tail ; caudal forked. 

 Fusichthys. Dorsal fin placed near the head ; tail lobed, 

 Silurus. Dorsal fin near the head j tail rounded. 



Plotosus. Dorsal, caudal, and anal fins nearly or quite 



united. . 



Clarias. Dorsal single ; caudal fin distinct. 



Plotosus. Dorsal single, united to the caudal and ventraL 



Heterobranchus. Dorsal fins two, the hinder adipose. 



Cetopsis. Eyes very minute, vertical ; cirri short. 



4. Sub-family Aspredin^. — Branchial opening very small ; 



head and body depressed ; opercula immoveable ; eyes 

 minute, vertical. 



CoTiLEPHORUS. Belly with cup-shaped suckers. 

 Platystacus. Tail and anal fin very long. 

 AsPREDO. Anal fin short. 

 AsTROBLEPAs. Head naked ; caudal fin truncate. 



* Except in Breviceps. 



