1898.] OP THE FAMILY MORMYBIDvB. 811 



Depth of body equal to length of head, Si to 4 times in total 

 length. Upper profile of head descending in a strong curve ; 

 snout much prolonged, tubiform, strongly compressed, curved 

 downwards, its length 2 to 2^ postocular part of head, and 5| 

 to 7 times its least depth, which nearly equals diameter of eye ; 

 latter | interorbital width ; lower jaw with a compressed dermal 

 appendage about as long as the eye ; mouth very small ; teeth 

 very small, conical, 5 in the upper jaw, 4 in the lower. Dorsal 

 28-31, originating above 6th or 7th ray of anal, its length 1| to 1| 

 in its distance from head. Anal 31-35, nearly equally distant 

 from base of ventral and base of caudal. Peccorai obtusely pointed, 

 ^ length of head, ventral g or rather less ; pectoral extending 

 beyond base of ventral. Caudal scaled, with pointed lobes. 

 Caudal peduncle 3 to 3^ times as long as deep, g to f length of 

 head. 75-85 scales in the lateral line, ^f^ in a transverse line on 

 the body, |5i|| in a transverse line between dorsal and anal, 18 

 round caudal peduncle. Brownish, with a rather indistinct darker 

 vertical band between dorsal and anal. 



Total length 380 millim. 



Upper Congo. 



19. Gnathonbmus cuhtibosteis. 



Gnathonemus curvirostris, Bouleng. Ann. Mus. Congo, Zool. i. 

 1898, p. 13, pi. vi. fig. 1. 



Depth of body 4|- times in total length, length of head 3i. Upper 

 profile of head descending in a strong curve ; snout much prolonged, 

 tubiform, strongly compressed, curved downwards, its length 3^ 

 postocular part of head, and 12 times its least depth, which a 

 little exceeds diameter of eye ; latter slightly more than i inter- 

 orbital width ; lower jaw with a compressed dermal appendage 

 1| diameter of eye ; mouth very small ; teeth very small, conical, 

 3 in the upper jaw, 4 in the lower. Dorsal 32, originating above 

 10th ray of anal, its length 1| in its distance from head. Anal 

 36, equally distant from base of ventral and base of caudal. 

 Pectoral pointed, | length of head, ventral nearly |, pectoral 

 extending beyond base of ventral. Caudal scaled, with pointed 

 lobes. Caudal peduncle 4 times as long as deep, more than g length 

 of head. 90 scales in the lateral line, ^ in a transverse line on the 

 body, t| in a transverse line between dorsal and anal, 16 round 

 caudal peduncle. Pale brownish above, whitish below. 



Total length 370 millim. 



Lower Congo, 



20. G-NATHONEMUS NTJMENIUS. 



Gnathonemus numenius, Bouleng. Ann. Mus. Congo, Zool. i. 

 1898, p. 14, pi. vi. fig. 2. 



Depth of body 4| to 5 times in total length, length of head 2f 

 to 2^. Upper profile of head convex; snout produced in an 



54* 



