410 SILUEID^. 



Dorsal I 7 ; spine a little shorter than head, curved, striated, smooth in 

 front, rather feebly serrated behind. Adipose dorsal 4 to 5 times as 

 long as deep, 4 to 6 times as long as its distance from rayed dorsal. 

 Anal IV 7-8, rounded or obtusely pointed in front. Pectoral spine 

 nearly as long as head, sometimes reaching ventral, feebly serrated on 

 outer border, strongly on inner. Ventral reaching anal or narrowly 

 separated from it. Caudal deeply forked, upper lobe the longer. Caudal 

 ])eduncle as long as deep. Grey-brown above and on the sides, white 

 beneath ; body and adipose fin with large black-and-white ocellar spots or 

 round black spots disposed with greater or less regularity at consider- 

 able intervals ; caudal fin with numerous small round blackish spots. 



Total length 490 millim. 



Gambia, Niger. 



1-2. Types. Kuncliow Creek, Gambia. J. S. Budgett, Esq. (P.). 



3. Skel. „ ,, 



4-6. Ad. Mnreji, Upp. Niger. „ 



7. Ad. Jebba, „ C. H. Finiiin, Escp (P.). 



9. SYNODONTIS FRONTOSUS. 

 VaiU. C. R. Soc. Philom. 1895, p. 48, and N. Arch. Miis. (3) vii. pi. x. fig. 8, & 



viii. 189G, p. 147 ; Bouleng. Ann. & Mag. N. H. (7) xvii. 190G, p. 5GG, and 



Fish. Nile, p. 358, pi. Ixv. (1907). 

 Sj/iiodo/dis nternii, Vincig. Ann. Mus. Geneva, (2) xix. 1898, p. 247. 



Depth of body 3 to of times in total length, length of head 3 to 3^ 

 times. Head 1^ to \\ times as long as broad, rugose above, the 

 rugosities extending more or less on the snout, which is rounded and as 

 long as postocular part of head ; eye supero-lateral, 4 (young) to 6 times 

 in length of head, If to 3 times in width of interocular region; occiput 

 simply convex. Mouth w'ith moderately developed lips; praemaxillary 

 teeth forming a short and broad baud ; movable mandibular teeth not 

 more than h diameter of eye, 33 to 48 in number. Maxillary barbel 

 with a rather narrow but very distinct marginal membrane in its 

 proximal fourth, 14- to 1| times length of head, reaching middle or end 

 of pectoral spine ; outer mandibular barbel \ or not quite h length of 

 inner, former Avith long, slender branches, latter with tubercular ramifi- 

 cations, Occipito -nuchal shield rough like the occiput, obtusely 

 tectit'orm, 1^ to 1^ times as long as broad, witli pointed or truncated 

 posterior processes. Humeral process a little longer than broad, flat or 

 with a very obtuse keel, sliarply j)ointe(l, usually not extending so fur 



