564 FISHES. 



ately before the posterior nostril, which is remote from the 



Fig. 258. — Mouth of Cnldoglanis megastoma, Australia. 



anterior, the latter being quite in front of the snout. Cleft of 

 the mouth transverse. Eyes small. The gill-membranes are not 

 confluent with the skin of the isthmus. Ventral fins many- 

 rayed. Head depressed ; body elongate. 



Three species are known from brackish waters of the 

 Indian Ocean freely entering the sea. Plotosus anguillaris is 

 distinguished by two white longitudinal bands, and is one of 

 the most generally distributed and common Indian fishes. — 



Fig. 259. — Cnidoglania microcephalus. 



Copidoglanis and Cnidoglanis are two very closely allied forms, 

 chiefly from rivers and brackish waters of Australia. None 

 of these Siluroids attain to a considerable size. Chaca, from 

 the East Indies, belongs likewise to this sub-family. 



