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. 

 Mormi/rus petersii, Gunth. Arch. £. Nat. 1862, p. 64, Proc. Zool. Soc. 1864, p. 22, 



pi. ii. fig. 2. and Cat. 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) ; Pappeiih. Mitth. 



Zool. Mijs. Berl. ili. 1907, p. 355. 



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



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. 



Gnathonemus petersii. 

 Type, after Giiuther (P. Z. S. 1864). f. 



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 i or | length 

 of snout, I to I 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 | 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, f to | length of head. 63-70 scales 

 in lateral line, J?=|| in transverse series on body, jJ^J in transverse series 



H 2 



