SG 



Moinmtm.E. 



1. Hgr., type. 

 2-6. Ad. 

 7-8. Yg. 

 9-10. Ad. & hgr. 



11. Hgr. 



12. Ad. 



Stanley Falls 



Coquilluitville. Upper Congo. 

 Boma, Lower Congo. 

 Loango, 

 Banana, 



Eev. W. H. Bentley (C). 



M. P. Delbez (C). 



)? 

 Brussels University. 

 M. P. Delbez (C). 



25. MARCUSENIUS WILVERTHI. 



Bonleng. Ann. JJus. Congo, Zool. i. 1898, p. 8, pi. iv. fig. 1, Pioc. Zool. Soc. 

 1898, p. 79G, and Poiss. Bass. Congo, p. 80 (1901). 



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

 times ; back gibbose, with convex outline in front of dorsal and concave 

 outline on nape. Head as long as deep, with convex upper and concave 

 lower profile ; snout short, ^ to ^ length of head ; mouth terminal or 

 subinferior, its width ^ to ^ length of head, below level of eye ; chin 

 with a strong globular swelling; teeth extremely minute, almost hidden 

 in the thick gums, truncate or slightly notched, 3 in upper jaw, G in 



Pis. 69. 



?•"%>.- 



Marcusenius wil verthi. 

 Type (A. M. C). ±. 



lower ; nostrils in posterior half of the snout, posterior a little lower 

 down than anterior, which is on a level with centre of eye ; eye moderate, 

 | to | length of snout or interorbital width. Dorsal 38-40, If to If 

 times length of anal, its length equalling its distance from head. Anal 

 25-27, originating below 12th or 13th ray of dorsal, a little nearer base 

 of ventral than base of caudal. Pectoral pointed, a little shorter than 

 head, 1| to If times length of ventral, extending a little beyond base 

 of latter. Caudal scaled in its basal two-thirds, with pointed lobes. 



