796 MB. G. A. botHjBngeb ok the fishes [Nov. 15 



Head 1| as long as deep ; snout rounded, | length o£ head ; 

 mouth small, subterminal, but situated considerably below the 

 level of the eyes ; no mental swelling ; teeth small, notched ; 

 eye rather small, | length of snout ; nostrils on a horizontal line 

 on a level with the lower border of the eye, midway between the 

 latter and the end of the snout. Dorsal 18, originating a little 

 posterior to origin of anal, its length 3 times in its distance from 

 head. Anal 23, a little nearer base of caudal than base of ventral. 

 Pectoral shorter than head, hardly reaching base of ventral. 

 Caudal with rounded lobes. Caudal peduncle li as long as deep, 

 i length of head. 70 scales in the lateral line, about 20 round 

 caudal peduncle. 



Total length 100 millim. 



Angola. — Type in the Vienna Museum. 



8. Mabcusbnius plagiostoma. 



Marcusenius plagiostoma, Bouleng. Ann. Mus. Congo, Zool. i. 

 1898, p. 7, pi. iii. fig. 1. 



Depth of body 3 times in total length, length of head 5. Head 

 as long as deep, "with slightly concave upper profile ; snout 1 length 

 of head ; mouth inferior, below anterior border of eye, its vfidth 

 ^ length of head ; teeth very small, feebly notched, 9 in the upper 

 jaw, 10 in the lower ; nostrils on a line with lo^ver border of eye, 

 posterior close to the eye; eye moderate, as long as snout, g 

 interorbital width. Dorsal 35, as long as its distance from head. 

 Anal 30, originating below 12th ray of dorsal, equally distant 

 from base of ventral and from base of caudal. Pectoral pointed, 

 as long as head. If length of A^entral, reaching beyond base of 

 latter. Caudal peduncle 4 times as long as deep, | length of 

 head. 55 scales in the lateral line, ^ in a transverse Hue on the 

 body, ^ in a transverse line between dorsal and anal, 16 round 

 caudal peduncle. Pale brownish above. 



Total length 170 millim. 



Lower Congo. 



9. MABCirSBNIXJS WILTEBTHI. 



Marcusenius wilverthi, Bouleng. Ann. Mus. Congo, Zool. i. 1898, 

 p. 8, pi. iv. fig. 1. 



Depth of body 2i to 3 times in total length, length of bead 

 4| to 5 ; back gilabose and keeled, with convex outline in front of 

 the dorsal and concave outline on the nape. Head as long as 

 deep, with convex upper and concave lo\^er profile ; snout short, 

 I to ^ length of head ; mouth terminal or subinferior, its width 

 I to g length of head, much below the level of the eyes ; chin 

 with a strong globular swelling ; teeth extremely minute, almost 

 hidden in the thick gums, truncate or slightly notched, 3 in the 

 upper jaw, 6 in the lower; nostrils in the posterior half of the 

 snout, posterior a little lower down than anterior, which is on a 



