1898.] OF THE FAMILY MORMTRID^. 807 



10. GrNATHONEMTTS MENTO. 



Mormyrus inento, Bouleng. Ann. & Mag. N. H. (6) vi. 1890, 

 p. 193 ; Steind. Notes Leyd. Mus. xvi. 1894, p. 72. 



Gnathonemus mento, Bouleng. Ann. Mus. Congo, Zool. i. 1898, 

 p. 11. 



Depth of body 3g times in total length, length o£ head 5. 

 Head as long as deep, with strongly curved upper profile ; snout 

 jQ length o£ head ; mouth small, on a line with lower border 

 of eye ; a strong mental swelling ; teeth small, notched, 5 in 

 the upper jaw, ia the lower ; eye moderate, | length of snout, 

 about I interorbital width. Dorsal 29-33, originating above 

 9th ray of anal, its length twice in its distance from head. 

 Anal 36, equally distant from base of ventral and from base of 

 caudal. Pectoral a little shorter than head, li| length of ventral, 

 extending a little beyond base of latter. Caudal scaled in its 

 basal half, with pointed lobes. Caudal peduncle nearly 4 times as 

 long as deep, as long as head. 84-8.5 scales in the lateral line, 

 .,j in a transverse line on the body, [| in a transverse line between 

 dorsal and anal, 12 round caudal peduncle. Silvery, with fine 

 brown dots, which are very crowded on the head and the dorsal 

 and ventral lines. 



Total length 190 millim. 



Gaboon, Liberia. 



11. Gnathonemus monteiri. 



Mormyrus monteiri, Giinth. Ann. & Mag. N. H. (4) xii. 1873, 

 p. 144. 



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

 1898, p. 11. 



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

 to 4|. Head 1;| to 1^ as long as' deep, upper profile descending 

 in a straight or slightly convex Une ; snout ^ leugth of head ; 

 lower jaw with a roundish, depressed dermal appendage about 

 as long as the eye ; teeth very small, notched, 5 in the upper 

 jaw, 6 in the lower ; eye moderate, | ro | length of snout, 

 § to I interorbital width. Dorsal 29-30, originating above 

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

 head. Anal 36-38, equally distant from base of ventral and 

 base of caudal. Pectoral pointed, little shorter than head, 

 more than twice as long as ventral, extending beyond base 

 of latter. Caudal scaled, with pointed lobes. Caudal peduncle 

 3 times as long as deep, | to f length of head. 78-80 scales in 

 the lateral line, |^ in a transverse line on the body, ^^ in a 



transverse line between dorsal and anal, 12 round caudal peduncle. 

 Uniform silvery. 



Total length 185 millim. 



Angola. 



