144 



]N[okmtrid,t:. 



47. Ad. JeLba, Upper Niger. 



48. Hgr. Abo, Lower Niger. 



49. Ad. (Type of Niger. 



H. occidentalis.) 



Capt. G. F. Abadie (P.). 

 Dr. W. J. Ansorge (C). 

 Mr. J. T. Dalton (C). 



11. GYMNARCHUS. 



Cuv. E. An. 2nd ed. ii. p. 357 (1829) ; Giinth. Cat. Fish. vi. p. 225 (18CG) ; 

 Bouleng. Proc. Zool. Soc. 1898, p. 821, and Fish. Nile, p. 74 (1907). 



Teeth forming a single complete series on the entire edge of 

 both jaws (14 in the upper, 24-28 in the lower), with compressed, 

 pointed, truncated, or slightly notched crowns finely serrated on the 

 sides ; palate and tongue toothless ; mouth wide, terminal. Nostrils far 

 apart, remote from the eye. Body much elongate, the tail gradually 

 attenuated into a point. Dorsal occupying the whole length of the 

 body; anal, ventral, and caudal fins absent. Vertebrae 114-120 

 (45-47 + 67-75). Air-bladder cellular, lung-like. 



Tropical Africa, north of the Equator. 



1. GYMNARCHUS NILOTICUS. 



Cuv. 1. c. ; Rifaud, Voy. Egypte, pi. 138 bis (1830) ; Erdl, Abh. Bayer. Ak. v. 

 1847, p. 209, pi. V. ; Heckel, Denkschr. Ak. Wien, vi. 1854, p. 11, pi. i. ; 

 Hyrtl, Denkschr. Ak. ^Vien, xii. 1856, p. 1, pis. i.— iv. ; Giinth. Cat. Fish. vi. 

 p. 225 (1866); Steind. Sitzb. Ak. Wien, Ixi. i. 1870, p. 556 ; Budgett, Tr. 

 Zool. Soc. xvi. 1901, p. 126, pi. xi. figs. 4 & 5 ; Bouleng. 11. cc. pi. xiii. 



Depth of body 7 to lOf times in total length, length of head 5|- to 6f 



Kg. 118. 



Gymnarclms mloticus. 

 White Nile (F. N.). i. 



times. Head 2 to 2| times as long as deep ; snout rounded, scarcely 

 projecting beyond the lower jaw ; eye very small; a strong fold of the 



