GNATHOXEMUS. y 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 milliin. 



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

 Museum, Tervueren. 



4. GNATHONEMUS PETE1{.S1I. 



Monuyrus petersii, Giinth. Arch. f. Nut. 18()2, p. (54:, Proc. Zool. Soc. 1864, j). 22, 



pi. ii. fig. 2, and Cat Fi.sh. vi. p. 218 (18(;(;). 

 GnatJionemus peters'ti, Gill, Proc. Ac. Pliihui. 1S(;2, p. 444 ; Bouleng. Proc. Zool. 



Soc. 1898, p. 808, and Poiss. Ba.s.s. Congo, p. 99 (1901) ; Puppenh. Mitth. 



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



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

 times. Head 1-g- 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 



Fi-. 79. 





Gnuthoaemus jjetersii. 

 Type, after Giiiither (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 j or i length 

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

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

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

 pointed, J to j 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 f length of head. 63-70 scales 

 in lateral line, J|"J| in transverse series on body, ~|[ in transverse series 



H 2 



