808 Mfi. G. A. BOULENGEB ON THE FISHES [NoV. 15, 



12. Gnathonemus PETEBSII. 



Mormyrus petersii^ Giinth. Arch. f. Nat. 1862, p. 64 ; Proc. 

 Zool. Soc. 1864, p. 22, pi. ii. fig. 2 ; Cat. vi. p. 218 (1866) ; and 

 in Petherick's Trav. ii. p. 256 (1869). 



Gnatlionemus peter sii, Gill, Proc. Ac. Philad. 1862, p. 444. 



Depth of bod3' 3| to 4^ times in total length, length of head 

 4| to 4|. Head Ig to If as long as deep, upper profile descending 

 in a straight or slightly convex line ; snout t length of head ; 

 lower jaw with a cylindrical, tapering dermal appendage, a 

 little longer than the snout and directed forwards ; teeth 

 very small, notched, 5 in the upper jaw, 6 in the lower ; eye 

 moderate, about ^ length of snout, f to § interorbital ^^idth. 

 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, 

 almost as long as head, twice as long as ventral, extending beyond 

 base of latter. Caudal scaled, with pointed lobes. Caudal pe- 

 duncle 3 times as long as deep, f to | length of head. 63-70 

 scales in the lateral line, ^^ in a transverse line on the body, [— 

 in a transverse line between dorsal and anal, 8 round caudal 

 peduncle. Dark brown, with two lighter vertical bars between 

 dorsal and anal. 



Total length 230 millim. 



Old Calabar, Congo, White Nile. 



13. Gnathonemus tjssheri. 



Mormyrus ussheri, Giinth. Ann. & JMag. N. H. (3) xx. 1867, 

 p. 110 ; "Steind. Notes Leyd. Mus. xvi. 1894, p. 71. 



Qnathonemus ussheri, Bouleng. Ann. Mus. Congo, Zool. i. 1898, 

 p. 11. 



Depth of body 3g times in total length, length of head 4f. 

 Head a little longer than deep, with curved upper profile ; 

 snout short, f length of head ; mouth small, on a level with 

 lower border of eye ; a globular ventral swelling ; teeth small, 

 notched, 5 in the upper jaw, 6 in the lower ; eye moderate, f 

 length of snout or interorbital width. Dorsal 27-28, oi'iginating 

 very slightly in advance of anal, its length a little less than twice 

 in its distance from the head. Anal 30-32, equally distant from 

 base of ventral and from base of caudal. Pectoral pointed, as 

 long as head, twice as long as ventral, extending beyond base of 

 latter. Caudal scaled in its anterior half, with pointed lobes. 

 Caudal peduncle twice as long as deep, slightly shorter than head. 

 55-57 scales in the lateral line, j? in a transverse series on the 

 body, 9 in a transverse series between dorsal and anal, 12 round 

 caudal peduncle. Brown. 



Total length 170 millim. 



Gold Coast, Liberia. 



