150 



OSTEOGLOSSID.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 tbe gill-cover. Gill-rakers long and slender, 

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



Fig. 121. 



Ilelerotis niloticus. 

 White Nile (P. JN.). i. 



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

 head. Ventral ^ to f 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, ^ 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 cf the caudal region of the body. 



Total length 800 millim. 



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



L. Loat, Esq. (C). 



1. Ad. 





Nile. 



2-3. Ad. 





El Kirbekan, near Korti 

 Upper Niie. 



4. Skel. 





Khartum. 



5,6-9. Ad. 



&hgr. 



Fashoda, White Nile. 



10. Hgr. 





White Nile, lat. 9°. 



11. A<1. 





Gabt-el-Megahid, between 

 Sobat and Bahr-eJ~Zeraf. 



J. Petherick, Esq. (C). 

 L. Loat, Esq. (C). 

 J. Petherick, Esq. (C). 

 Oapt. S. Flower (P.). 



