On Three new Freshwater FLthes. 51 



above ; snout obtusely pointed, as long- as postocular part of 

 head ; eye su|>ero-latercal, its diameter 4 to 5| in length of 

 head, 1§ to 2^ times in interorbital width ; praemaxillary 

 teeth forming a short and broad baud ; movable mandibular 

 teeth not half diameter of eye, 30 to 40 in number; maxiUary 

 barbel not distinctly margined, extending about to middle of 

 pectoral spine ; mandibular barbels with obtuse or tubercular 

 branches, outer at least twice as long as inner and f to f 

 length of head. Gill-openings not extending downwards 

 beyond root of pectoral spine. Occipito-nuchal shield rough 

 like the occiput, obtusely tectiform, not or "but slightly longer 

 than broad, the posterior processes rounded. Humeral 

 process rugose, acutely pointed, extending as far back as 

 occipito-nuchal process. Skin without villosities. Dorsal I 7 ; 

 spine nearly as long as head, striated, strongly serrated in 

 front, with a few very feeble serrte behind. Adipose dorsal 

 rather small, not longer than its distance from the rayed 

 dorsal. Anal III 8-9. Pectoral strongly serrated on outer 

 side, still more strongly on inner. Caudal fin deeply notched, 

 crescentic. Caudal peduncle longer than deep. Brown, 

 blotched and marbled with darker, with three broad irregular 

 dark bands, the first below the dorsal fin, the second below 

 the adipose, the third in front of the caudal fin; tins whitish, 

 with round black spots. 



Total length 90 mm. 



Several specimens from the Ja River. 



The smallest species of the genus. The first specimens 

 received were thought by me to be young 8. obesus, Blgr., a 

 species which has not yet been discovered in Cameroon. 



Clarias longior. 



Depth of body 8 to 9 times in total length, length of head 

 5 to 5| times. Head extremely depressed, once and \ as long 

 as broad, smooth ; occipital process very short, pointed ; 

 frontal fontanelle knife-sliai)ed, about 3 times as long as 

 broad ; occipital fontanelle smaller, in advance of occipital 

 process ; eye very small, 2^ times in length of snout, 5 or 5^ 

 times in interorbital width, which equals width of mouth and 

 I length of head ; band of pra3maxillary teeth 4 times as long- 

 as broad ; vomerine teeth granular, forming a curved band 

 which is as broad as the prairaaxillary band ; nasal barbel f 

 to I length of head, maxillary once and j to once and ^, outer 

 mandibular once, inner mandibular | to |. Gill-rakers very 

 few, 12 on anterior arch. Clavicles concealed under the skin. 

 Dorsal 80, its distance from occipital process ? to f length of 



4^- 



