160 ADDENDA, VOL. 1. 



darker on the back, spotted and marbled with dark brown ; fins 

 brown. 



Total length 70 millim. 



Lake Ngarai Basin, Bechuanaland. 

 1-2. Types. Okovango R. E. B. Woosnain, Esq. (C). 



Distinguished from M. Ihuysii by the lower number of dorsal and 

 anal fin-rays. 



8&. MARCDSENIUS BREVIS. 

 Bouleng. Rev. Zool. Afr. ii. 1913, p. 156. 



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

 times. Head as long as deep ; snout rounded, \ length of head, pro- 

 jecting a little beyond mouth ; mouth small, well below level of lower 

 border of eye; teeth moderate, notched, 7 in upper jaw, 8 in lower; 

 eye as long as snout, its diameter not quite \ interocular width ; 

 posterior nostril a little lower down than upper, close to eye. Dorsal 

 19, originating above 4th or 5th ray of anal, its length J its distance 

 from head. Anal 24-26, nearer caudal than base of ventral. Pectoral 

 a little shorter than head, not reaching extremity of ventral. Caudal 

 with pointed lobes. Caudal peduncle twice as long as deep, f length 



7—8 



of head. 42-44 scales in lateral line, jjj^^ in transverse series on body, 

 y in transverse series between dorsal and anal, 12 round caudal 

 peduncle. Brownish, head darker, with dark dots and irregular spots. 



Total length 60 millim. 



Uelle, Upper Congo. — Type in Congo Museum, Tervueren. 



1. One o£ the types. Dungu, Upper Uelle. (Japt. Hutereau (0.). 



Distinguished from M. Ihuysii by the lower number of scales in the 

 lateral line. 



9 a. MARGUSENIUS HUTEREAUI. 

 Bouleng. Rev. Zool. Afr. ii. 1913, p. 155. 



Depth of body 3 times in total length, length of head 4 times. Head 

 as long as deep ; snout very short, rounded, strongly jirojecting beyond 

 the mouth, which is situated below the eye ; width of mouth 2,\ times in 

 length of head ; teeth very small, bicuspid, 7 in upper jaw, 8 in lower ; 

 nostrils on a line with centre of eye, posterior nearly touching eye, which 

 is longer than snout, i\ times in length of head, and l^ times in inter- 

 ocular width. Dorsal 19, originating above 10th ray of anal, its base 



