-SO CHAKACINIDjE. 



Head not deeper than broad : depth of body 

 5 to 6 times in total length ; pectoral 



shorter than head ; Sc. 50-55 '/4 ■ . ■ 5. N. niloticus, Joann., p. 283. 

 Head not deeper than broad ; depth of body 

 6£ to 7£ times in total length ; pectoral 



shorter than head ; Sc. 52-57 ^| . . . 6. N. elongatns, Blgr., p. 284. 



B. Lateral line incomplete, reduced to a few tubules ; Sc. 50 g| ; length of 

 head 3 times in total length . . . 7. N. ocellicauda, Blgr., p. 285. 

 II. Dorsal originating well in advance of ventrals, with 11 or 12 branched rays ; 

 head deeper than broad, 4 to 4£ times in total length ; depth of body 

 4£ to 5 times in total length ; pectoral shorter than head. 

 Sc. 48-49 5|=? 8. W. tcenia, Blgr., p. 286. 



Sc. 52 ~ , 9. jy. dimidiatus, Pellegr., p. 286. 



1. NANNOCHAUAX BREVIS. 

 Bouleng. Ann. Mus. Congo, Zool. ii. p. 27, pi. viii. fig. 2 (1902). 



Depth of body 4J to 5 times in total length, length of head 4 times. 

 Head deeper than broad ; snout as long as eye, which is a little more 

 than 3 times in length of head and equals interorbital width. Dorsal 

 HI 10, originating above base of ventral, situated a little nearer end of 

 snout than caudal, longest ray equal to or a little greater than length 

 of head. Anal 111 6. Pectoral as long as head, extending beyond root 



Fig. 213. 



Nannodiarax brevis. 

 Type (A. M. C). 



of ventral. Caudal forked, with pointed lobes. Caudal peduncle twice 

 as long as deep. Scales 37-38 A, 4 between lateral line and root of 

 ventral. Olive above, yellowish beneath ; 5 large brown spots across 

 the back, and two bars of the same colour on the caudal peduncle ; 

 a series of dark spots on each side ; a black spot at base of caudal fin 

 and a blackish spot or bar across each lobe of the latter. 



Total length 45 millim. 



Upper Congo. — Type in Congo Museum, Tervueren. 



