80 



MOEMYRID^. 



19. MARCUSENIUS PLAGIOSTOMA. 



Eouleng. Ann. Mus. Congo, Zool. i. 1898, p. 7, pi. iii. fig. 1, Proc. Zool. See. 

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



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

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

 upper profile ; snout -5- to -j length of head ; mouth inferior, its 

 width y 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, f or f interorbital width. Dorsal 31-35, as 



Fis. 63. 



Marcuseiiius jjlagiostoma. 

 Type (A. M. C). f 



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

 12th ray of dorsal, equally di^tant 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, | to | length of head. 55-70 scales in lateral line, ' 



10-12 



15-L'O 

 20-23 



m 



transverse series on body, j^^ in transverse series between doisal 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 typos. Boma, Lower Con 00. 



Matadi, 



Kutu, L. Leopold IT. 

 Irebu, Upper Congo. 



2-3. Hgr., two o£ the type: 



4. Ad. 



5-6. Ad. & hgr. 



7. Skel. 



8-11. Ad. & bar. 



Capt. Wilverth (().). 

 M. P. Delhez (C). 



Upper Congo. 



Brussels University. 



