82 



1. Hgr. 



2. Hgr., type of M. tan- 



gan'icanvs. 

 3-4. I-Tgr., types of M. 

 tanganicanus. 



MORMYRID.^.. 



L. Xyassa. 



River at Msaniltn, 



L. Tanganyika. 

 SuinLii, L. Tanganyika. 



J. A. Williams, Esq. (C). 

 Dr. "W. A. Cimnington (C). 



21. MARCUSENIUS PETHERTCI. 



Mormi/rus clisco7-h>/ncInis (non Peters), G Until. (lat. Fish. vi. p. 220 (ISGG), and 



Petherick's Trav. ii. p. 2.5.5 (1869). 

 Marcnsenius petherici, Bouleng. Ann. Mus. Congo, Zool. i. p. 7 (1898), Proc. Zool. 



Soc. 1898, p. 797, and Fish. Nile, p. 45, pi. viii. fig. 3 (1907). 



Depth of body 2f to 3^ times in total length, length of head 4^ to 5 

 times. Head as long as deep or a little deeper than long, If to 1| 

 times as long as broad ; snout -| to :j length of head, rounded, projecting 

 beyond mouth ; mouth situated below nostrils, its width 4|- to 5| times 

 in length of head; teeth bicuspid, truncate when worn down, 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 longer than 

 snout, about f interocular width. Dorsal 34-3(5, as long as or a little 



Firr. 65. 



^^^ 



il/anusenius j^ctJicrici. 

 Type(F.N.). |. 



shorter than its distance from head. Anal 24-2G, originating below 

 14th to IGth ray of d(^rsal, equally distant from base of ventral 

 and from base of caudal, or a little nearer latter. Pectoral pointed, 

 subfalcate, nearly as long as head, If to If times length of ventral and 

 extending beyond base of latter. Caudal with pointed lobes. Caudal 

 peduncle 2.V to 3 times as long as deep, as long as or a little sliorter 



