284 



SILURID^. 



little shorter in young ; eye perfectly lateral, 3 (young) to 5 times in 

 length of head, 1 J (young) to nearly 3 times in interorbital width ; 

 width of mouth a little less than interorbital width ; vomero-palatine 

 teeth forming an uninterrupted band, which is nearly as broad as or 

 narrower than the band of preemaxillary teeth. Nasal barbel as long as 

 or shorter than eye ; maxillary barbel shorter than head ; inner mandi- 

 bular barbel about half length of outer, which is inserted behind it and 

 measures about \ to f the length of the maxillaiy barbel. Gill-rakers 

 moderately long, widely set, 7 to 11 on lower part of anterior arch. 

 Dorsal I 5-6, partly or entirely in advance of vertical of ventrals and 2 to 

 2^ times as distant from caudal as from end of snout ; its spine slender, 

 feebly serrated behind, f to once length of head, produced into a short 



Fio-. 232. 



Eutropius niloticus. 

 Upper Nile (F. N.). ^ 



filament. Anal 54-69, 4 or 5 anterior rays simple, the following 

 gradually decreasing in length. Pectoral reaching or not ventral, its 

 spine strongly serrated on inner side and stronger than and nearly equal 

 in length to that of dorsal. Caudal deeply forked, with pointed lobes. 

 Caudal peduncle 1^ to IJ times as long as deep. Silvery or pale 

 brownish, darker green or olive on the back ; a blackish or green ill- 

 defined blotch on each side above the pectoral fin ; dorsal and pectoral 

 fins sometimes blackish. 

 Total length 400 millim. 



Nile System and rivers of West Africa, from the Senegal to the 

 Ogowe, — Types in the Senckenberg Museum, Frankfort (Main). 



1. One of the types. Egypt. Dr. Kiipix'Ii (('.). 



2-3. Hm-. Nile. 



