390 



SILTJltlD^. 



upper surface rough with pearl-like granules ; occipital process tectiform, 

 longer than broad at the base, in contact with the interneural shield, 

 which is small and crescentic and studded with granules same as on the 

 skull; snout short and broad, projecting very feebly beyond mouth; 

 eye lateral, oval, 1J to If times in length of snout, 4^ to 5^ times in 

 length of head, 2 to 3 times in interocular width ; preemaxillary band of 

 teeth about 5 times as long as broad ; palate with two large triangular 

 groups of granular teeth, narrowly separated from each other in front. 



Pig. 300. 



Ariux africanus. 



Type. 



i 



2- 



Gill-rakers rather long, 14 or 15 on lower part of anterior arch. Dorsal 

 I 7, spine f to f length of head, very feebly serrated on both sides. 

 Adipose dorsal small, its base f to £ that of rayed dorsal, If to 2 times 

 as distant from latter as from caudal. Anal 19-21 (13-15 rays branched). 

 Pectoral spine similar to dorsal. Ventral not reaching origin of anal. 

 Caudal deeply forked, with long pointed lobes. Caudal peduncle twice 

 as long as deep. Brownish above, silvery on the sides, white beneath. 



Total length 250 millim. 



Pangani River, East Africa. 



1-2. Types. Pangani R. Sir Lambert Playfair (P.). 



3, 4. Types, skins. „ 



