8YN0D0NT1S. 41 3 



not \ diameter of eye, 33 to 38 in number. Maxillary barbel without 

 or with a mere rudiment of a marginal membrane, 1} to 1^ times as 

 long as bead, reaching middle of posterior fourth of pectoral spine ; 

 outer mandibular barbel twice or a little more than twice as long 

 as inner, former with long slender branches, latter with tubercular 

 ramifications. Gill-openings not extending downwards beyond root of 

 pectoral spine. Occipito-nuchal shield granulate like the occiput, ob- 

 tusely tectiform, with pointed or truncate posterior processes. Humeral 

 process flat, granulate, a little longer than broad, sharply pointed, 

 extending as far back as occipito-nuchal process, or not quite so far. 

 Dorsal I 7 ; spine feebly curved, as long as or a little shorter than head, 

 smooth or very finely serrated in front, feebly serrated behind, with short 

 or rather long filamentous prolongation. Adipose dorsal 3 to 4 times as 

 long as deep, 3^ to 5 times as long as its distance from rayed dorsal. 

 Anal IV 8, rounded. Pectoral spine as long as or a little shorter than 

 head, feebly but distinctly serrated on the outer edge, very strongly on 

 inner, reaching or nearly reaching ventral ; latter rounded, extending to 

 or slightly beyond origin of anal. Caudal deeply forked, upper lobe the 

 longer. Caudal peduncle deeper than long. Grey, tinged with olive 

 on the head and back ; fins dark, except the spines and their filaments, 

 which are whitish ; caudal tin greyish white, with a deep black band 

 along each lobe ; barbels white. 



Total length 240 millim. 



White Nile. 



1. Type. Mouth of Lake No. L. Lout, Esq. (C). 



2. „ Ka-vra. „ 



3. „ Nur ed Daira. „ 



11. SYNODONTTS GRANULOSUS. 

 Bouleng. Ann. & Mag. N. H. (7) vi. 1900, p. 480, Poiss. Bass. Congo, p. 308 

 (1901), and Tr. Zool. Soc. xvi. 1901, p. 149, pi. xvi. 

 Depth of body equal to length of head, 3 to 3-§- times in total length. 

 Head not or but slightly longer than broad, covered with granular 

 asperities from between the eyes ; snout rounded, as long as postocular 

 part of head ; eye superolateral, b\ to 6 times in length of head, 2^ to 

 2f times in interorbital width ; lips moderately developed ; praemaxillary 

 teeth forming a short, broad band ; movable mandibular teeth barely £ 

 diameter of eye, 40 to 42 in number. Maxillary barbel without marginal 

 membrane, as long as or a little longer than head, not extending beyond 



