MARCUSENIUS. 



81 



.20. MARCUSENIUS DISCORHYNCHUS. 



Mormyrus discorhynchus, Peters, Mon. Berl. Ac. 1852, p. 275, and Reise Mossamb. 



iv. p. 75, pi. xiv. (1868). 

 Marcusenius discorhynchus, Bouleng. Proc. Zool. Soc. 1898, p. 7, and Poiss. Bass. 



Congo, p. 82 (1901) ; Pappenh. Mitth. Zool. Mus. Berl. iii. 1907, p. 349. 

 Marcusenius tanganicanus, Bouleng. Tr. Zool. Soc. xvii. 1906, p. 545, pi. xxx. fig. 1. 



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

 times. Head as long as deep ; snout rounded, f length of head ; mouth 

 small, subiuferior, its width \ to \ length of head ; teeth small, notched, 

 5 in upper jaw, 6 in lower ; nostrils on a line with lower border 

 of eye, nearer latter than end of snout ; eye moderate, as long as or a 

 little shorter than snout, § interorbital width. Dorsal 30-36, its length 



Fig. 64. 



Marcusenius discorhynchus. 

 Type, after Peters (Eeise Mossamb.). f. 



lj to 1-j times in its distance from head. Anal 23-27, originating 

 below 8th to 12th ray of dorsal, equally distant from base of ventral 

 and from base of caudal. Pectoral pointed, nearly as long as head, 

 1-j times length of ventral, extending to base of latter or a little beyond. 

 Caudal with obtusely pointed lobes. Caudal peduncle 2 to 2\ times as 

 long as deep, a little shorter than head. 65-70 scales in lateral line, 



17-JJ0 • ■ v j 12-15 . ' , . 



rtjp^ m transverse series on body, jyrf 5 m transverse series between 

 dorsal and anal, 12 or 14 round caudal peduncle. Dark olive or 

 brownish above, silvery white beneath. 



Total length 160 millim. (grows to 260). 



Lower Zambesi ; Lake Nyassa ; Katanga ; Lake Tanganyika. — -Types 

 in Berlin Museum. 



VOL. i. G 



