226 PROCEEDINGS OF THE ACADEMY OF [Apr., 



Clarias mossambious Peters. 



Shebeli River, East Africa. Giinther says, "Two small specimens 

 of Clarias collected on the Shebeli River are not in sufficiently good 

 condition to be determined. The form of the vomerine band is 

 very different from that of the fish described as C. smithii. " These 

 examples show the hind edge of the vomerine band slightly double- 

 convex, evidently an individual character, as they are in all other 

 respects similar to the present species and to which they undoubtedly 

 belong. 



Clarias batrachus (Linnaeus). 



Padang and Batu Sangkar, Sumatra. 



Clarias angolensis Steindachner. 



West Africa, also the Luali River at Lundo. 



Clarias duobaillui sp. nov. Fig. 7. 



Head 4^; depth at anal origin 6j; D. 76; A. 57; P. I, 10; V. i, 5; 

 head width IJ in its length; head depth at occiput If; snout 2|; 

 eye 8; mouth width 2; interorbital 1|; least depth of caudal peduncle 

 3|; caudal If; pectoral If; ventral 2|. 



Body elongate, sides and trunk well compressed, deepest at dorsal 

 origin, and profiles mostly similar. Caudal peduncle entirely 

 free, well compressed. 



Head broad, depressed, upper surface slightly more convex behind, 

 and profiles similar. Snout broad, depressed, slightly protrudes 

 beyond mandible, and length about half its greatest width. Eye 

 small, rounded, superior, and placed near first | in head length. 

 Eyelids free. Mouth wide, with very short commissure. Teeth 

 fine, villose, in moderately broad similar bands in jaws, upper area 

 simple and lower ends in narrow angle behind. Vomerine teeth 

 similar in size and area to outel: or maxillary band. Tongue broad, 

 depressed, free around edges, without teeth. Upper and lower 

 buccal folds well developed, similar. Anterior nostrils in short 

 simple tubes near edge of snout, much closer than posterior. Latter 

 close before eye, and simple slits just behind base of nasal barbel, 

 which reaches back opposite tip of occipital process. Maxillary 

 barbel extends back beyond depressed pectoral about midway 

 between tip of latter and ventral origin. Outer mental barbel 

 extends back beyond pectoral spine tip, though not quite to tip of 

 depressed fin. Inner mental barbel reaches pectoral origin. Inter- 

 orbital space broadly convex. Fontanel shaped like a pluml^-bob, 

 within the interorbital region. Occipital fontanel close to base of 



