80 



MOKMYRID.E. 



10. MARCUSENIUS PLAGIOSTOMA. 

 Bouleng. Ann. Mus. Congo, Zool. i. 1898, p. 7, pi. iii. fig. 1, Proc. Zool. Soc. 

 1898, p. 796, and Poiss. Bass. Congo, p. 79 (1901). 



Depth of body 2| to 3 times in total length, length of head A\ to 

 5 times. Head as long as deep, with convex or slightly concave 

 upper profile ; snout ^ to \ length of head ; mouth inferior, its 

 width -§- to \ length of head ; teeth very small, feebly notched, 7 to 

 9 in upper jaw, 8 to 10 in the lower; nostrils on a line with lower 

 border of eye, posterior close to the eye; eye moderate, as long as or 

 slightly longer than snout, § or f interorbital width. Dorsal 31-35, as 



Bis: 63. 



■ ■■■■ .....■■■ 



'fllaa 



Marcusenius plagiostoma. 

 Type (A. M. C). f. 



long as its distance from head. Anal 27-30, originating below 10th to 

 12th ray of dorsal, equally distant from base of ventral and from base of 

 caudal. Pectoral pointed, as long as head, once and -| length of ventral, 

 reaching beyond base of latter. Caudal peduncle 3^ to 4 times as long 

 as deep, f to f length of head. 55-70 scales in lateral line, .1^% in 

 transverse series on bodv, tt^T in transverse series between dorsal and 

 anal, 16 round caudal peduncle. Pale brownish above, silvery beneath ; 

 fins greyish. 



Total length 200 millim. 



Congo. — Types in Congo Museum, Tervueren. 



1. Ad., one of the types. Boma, Lower Congo. 



Matadi, „ 



Kutu, Li Leopold IT. 

 Irebu, Upper Congo. 



2-3. Hgr., two of the types 



4. Ad. 



5-6. Ad. & hgr. 



7. Skel. 



8-11. Ad. & hgr. 



Capt. Wilverth (C.). 

 M. P. Delhez (C). 



Upper Congo. 



Brussels University. 



