150 



0STE0GL0SS1D.E. 



front, obliquely bent on the sides, nearly square when fully open, 

 extending to below anterior border of eye or a little beyond ; a very 

 large dermal flap borders the gill-cover. Gill-rakers long aud slender, 

 closely set. Dorsal 32-37, beginning a little further back than the 



^. 



^ 



Fi^. 121. 



Heterotis nUotlcua. 

 White Nile (F. ^.). \. 



anal ; latter 34 to 39. Pectoral obtusely pointed, | to | length of 

 head. Ventral J to | length of head. Caudal short, rounded. Caudal 

 peduncle very short. Scales more or less rugose, 32-38 in lateral line, ^ 

 in transverse series on body in front of ventral, g between origin of dorsal 

 and anal. Lateral line extending in a straight line from above gill- 

 cover to middle of caudal peduncle ; the canals tubular in the young, 

 deep grooves in the adult. Brown, grey, or olive ; young with dorsal and 

 anal marked with rather indistinct longitudinal streaks, and a round 

 dark spot on each of the scales of the caudal region of the body. 



Total length 800 millim. 



Tropical Africa north of the Equator. — Type in Berlin Museum. 



L. Loat, Esq. (C\). 



J. Pcthcrick, Esq. (C). 

 L. Loat, Esq. (C). 

 J. Petherick, Esq. (C). 

 (S.pt. S. Flowrr (P.). 



