236 



SlLURiD^E. 



Depth of body 5 to 9 times in total length, length of head 3 to 

 3J times. Head IJ to If times as long as broad, its upper surface 

 coarsely granulate in the adult; occipital process angular or rounded; 

 frontal fontanelle sole-shaped or knife-shaped, 2J to 4 times as long as 

 broad, 3^ to 6 times in length of head ; occipital fontanelle small, in 

 advance of occipital process ; eye 2 (young) to 4 J times in length of 

 snout, 4 to 7 times in interorbital width ; width of mouth equal to or a 

 little less than interorbital width ; band of pra^maxillary teeth 4 (young) 

 to 6 times as long as broad; vomerine teeth granular, formiug a 

 crescentic band with or without a posterior median process, its greatest 

 width, in the middle, IJ to 2J times that pj„ 2Q7^ 



of the praemaxillary band ; anterior man- ., 



dibular teeth pointed, posterior granular ; 

 nasal barbel 5^ to f length of head (up to 

 f in the very young) ; maxillary barbel 



Clarias lazera. 

 Lower Nile (F. N.). 



usually a little shorter than head, sometimes a little longer (up to once 

 and a half in the very young), reaching extremity of pectoral spine 

 or a little beyond extremity of pectoral fin ; outer mandibular barbel 

 1} to 1| times as long as inner, which measures f to f length of 

 head. Gill-rakers long and closely set, 35 (very young) to 135 on 

 anterior arch. Clavicles striated or rugose with granulations, more or 

 less distinct under the thin skin. Dorsal 62-82, its distance from 

 occipital process y to ^ length of head, its distance from caudal not 

 greater than diameter of eye. Anal 50-65, narrowly separated from 

 caudal. Pectoral | to ^ length of head, the spine serrated on the outer 

 side and f (young) to | the length of the fin. Ventrals equally distant 

 from end of snout and root of caudal, or a little nearer the former. 

 Caudal about half length of head. Greyish olive or olive-brown to 



