MAE CU SEN J us. 75 



14. MARCUSENIUS NIGRICANS. 

 Boulong. Ann. & Mag. N. H. (7) xvii. 190G, p. 4:U, and Fisli. Nile, p. 40, pi. ix. 

 fig. 2 (1007). 



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

 4^ times. Head as long as deep; snont about ^ length of head, 

 rounded, projecting beyond mouth ; mouth situated below nostrils, its 

 width about 4 times in length of head ; teeth bicuspid, 7 in upper jaw, 

 8 in lower ; anterior nostril on a line with centre of eye, midway 

 between latter and end of snout, posterior nostril a little lower down, 

 close to eye ; eye moderate, as long as snout, ^ to f interocular width. 

 Dorsal 15-18, originating above 5th or 6th ray of anal, its length about 



Fijx. 58. 



Marcusenhis nigricans. 

 Type(F. N.). |. 



f its distance from head. Anal 24-25, nearly equally distant from base 

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

 long as or a little shorter than head, 2 to 2^ times as long as ventral 

 and extending beyond root of latter. Caudal with pointed lobes. 

 Caudal peduncle 2^ to 2f times as long as deep, f to f length of head. 

 46-53 scales in lateral line, j^^tTo ^^i transverse series on body, ^^^1 in 

 transverse series between dorsal and anal, IG to 20 round caudal 

 peduncle. Uniform blackish brown. 



Total length 93 millim. 



Lake Victoria. 

 1-9. Types. Mouth of Katonga R. Mr. E. Degen (C). 



15. MARCUSENIUS ISIDORI. 

 Mormyriis isidori, Cuv. & Val. Hist. Poiss. xix. p. 285 (184(i) ; Guutli. Cat. Fish. 



vi. p. 221 (1866), and Petherick's Trav. ii. p. 256 (1869). 

 Petrocephalus isidori, Marciisen, Bull. Ac. St. Peterj^b. xii. 1854, p. 14, and Mem. 



Ac. St. Petersb. (7) vii. 1864, no. 4, p. 150. pi. v. fig. 20. 



