798 MB. G. A. BOULENGEB ON THE FISHES [NoV. 15 



the end of the snout ; eye moderate, as long as snout, at least f 

 interorbital width. Dorsal 35-36, a little shorter than its distance 

 from head. Anal 26, originating below 15th or 16th ray of 

 dorsal, equally distant from base of ventral and from base of 

 caudal. Pectoral pointed, as long as head, Ig to 1| length of 

 ventral, extending beyond base of latter. Caudal with obtusely 

 pointed lobes. Caudal peduncle 2i as long as deep, as long as 

 head. 55-60 scales in the lateral line, J-|^ in a transverse line on 

 the body, ^^g in a transverse line between dorsal and anal, 12 

 round caudal peduncle. Silvery, brownish on the back. 



Total length 210 millim. 



Upper Nile. 



12. Maeousenius psittacus. 



Mormyrus i^sittacus, Bouleng. Ann. & Mag. N. H. (6) xx. 1897, 

 p. 427. 



Marcusenms psittacus, Bouleng. Ann. Mus. Congo, Zool. 

 1898, p. 7. 



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

 Head as long as deep ; snout rounded, ^ length of head ; mouth 

 small, terminal, below level of eye, its width \ length of head ; 

 teeth small, notched, 3 in the upper jaw, 4 in the lower ; chin 

 slightly swollen ; nostrils on a line with centre of eye, nearer 

 latter tlian end of snout ; eye rather large, slightly longer than 

 snout, equal to interorbital width. Dorsal 33, as long as its 

 distance from the head. Anal 23, originating below 13th ray of 

 dorsal, equally distant from base of ventral and from base of 

 caudal. Pectoral pointed, a little shorter than head, li as long 

 as ventral, reaching base of latter. Caudal with pointed lobes. 

 Caudal peduncle 3 times as long as deep, as long as head. 60 

 scales in the lateral line, if in a transverse line on the body, j^ 

 in a transverse line between dorsal and anal, 12 round caudal 

 peduncle. Silvery, dark grey on the back. 



Total length 125 millim. 



Upper Congo. 



13. MARcrsENiua isidobi. 



Mormyrus isidori, Cuv. & Val. xix. p. 285 (1846); Giinth. Cat. 

 p. 221 (1860). 



Petrocejjhalus isidori, Marcusen, Bull. Ac. St. Petersb. xii. 

 1854, p. 14, and Mem. Ac. St. Petersb. (7) vii. 1864, no. 4, p. 150, 

 pi. V. tig. 20. 



Marcusenius isidori, Bouleng. Ann. Mus. Congo, Zool. i. 1898, 

 p. 7. 



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

 4 to 4^. Head as long as deep ; snout short, rounded, \ ^o \ 

 length of head, projecting beyond the mouth; mouth inferior, 

 just in front of vertical of anterior border of eye, its width i to 5 



