GNATHONEMUS. 



99 



8 round caudal peduncle. Brown, darker on head and caudal peduncle, 

 a blackish vertical band from anterior rays of dorsal to anal ; fins 

 blackish. 



Total length 85 millim. 



Upper Congo (Stanley Pool and L. Leopold II.). — Type in Congo 

 Museum, Tervueren. 



4. GNATHONEMUS PETERSII. 



Mormyrus petersii, Giinth. Arch. f. Nat. 1862, p. 64, Proc. Zool. Soc. 1864, p. 22, 



pi. ii. fig. 2, and Oat. Fish. vi. p. 218 (1866). 

 Gnathonemus petersii, Gill, Proc. Ac. Philad. 1862, p. 444 ; Bonleng. Proc. Zool. 



Soc. 1898, p. 808, and Poiss. Bass. Congo, p. 99 (1901) ; Pappcnh. Mitth. 



Zool. Mns. Berl. iii. 1907, p. 355. 



Depth of body 3f to 4^ times in total length, length of head 4 \ to 4| 

 times. Head 1^ to 1^ times as long as deep, upper profile descending 

 in a straight or slightly convex line ; snout f length of head ; lower jaw 

 with a cylindrical, tapering dermal appendage, as long as or a little 



Fig. 79. 



's§ 







Gnatlionemus petersii. 

 Type, after Giinlher (P. Z. 8. 1864). 



longer than the snout and directed forwards ; teeth very small, notched, 

 3 or 5 in upper jaw, 5 or 6 in lower ; eye moderate, about \ or f length 

 of snout, f to \ interorbital width. Dorsal 27-29. originating above 

 10th to 12th ray of anal, its length nearly twice in its distance from 

 head. Anal 34-36, nearer base of caudal than base of ventral. Pectoral 

 pointed, f to f as long as head, twice as long as ventral, extending 

 beyond base of latter. Caudal scaled, with long, pointed lobes. Caudal 

 peduncle 3 times as long as deep, § to f length of head. 63-70 scales 

 in lateral line, j?^ in transverse series on body, ]jj~jj in transverse series 



H 2 



