SYNODONTIS. 435 



feebly serrated behind. Adipose dorsal 3 to 4 times as long as deep, 

 1^ to 2|^ times as long as its distance from rayed dorsal. Anal IV 8-9, 

 rounded or obtusely pointed in front. Pectoral spine nearly as long as 

 dorsal, not reaching ventral, moderately or rather feebly serrated on 

 outer border, very strongly on inner. Caudal deeply forked, upper lobe 

 the longer and more or less produced into a filament. Caudal peduncle 

 as long as deep or a little longer than deep. Brown above and beneath, 

 spotted or dotted with darker, the spots more distinct in the young, 

 in which the fins are whitish, with round black spots. 



Total length 220 millim. 



Gold Coast to Gaboon. 



1-4. Hgr. & jg. Offim R., Gold Const. R. B. N. Walker, E^q. (C). ; 



Dr. A. Giinther (P.). 



5-6, Hgr. Infoan, ,, „ 



7. Type. Opobo R., Old Calabar. Miss Kingsley (C). 



8. Ad. Enyong R., „ Major W. A. C. Cockburn (P.). 



9. Ad. Kribi R., S. Cameroon. G. L. Bates, Esq. (C). 

 10-11. Types. Gaboon. 



28. SYNODONTIS ROBBIANUS. 

 J. A. Smith, Proc. R. Soc. Edinb. viii. 1873, p. 92, fig. 



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

 3| times. Head about IJ times as long as broad, rugose above ; 

 snout obtusely pointed and as long as or slightly longer than 

 postocular part of head ; eye supero-lateral, 4 to 5 times in length 

 of head, 1 J to 1 J times in interorbital width ; lips moderately developed ; 

 prsemaxillary teeth forming a short and broad band ; movable mandi- 

 bular teeth not quite J diameter of eye, 15 to 20 in number. Maxillary 

 barbel with a broad marginal membrane, 1^ to 1 J times length of head, 

 reaching middle or posterior third of pectoral spine ; outer mandibular 

 barbel about twice as long as inner, former with moderately long, 

 slender branches, latter with short, tubercular branches. Gill-opening 

 not extending downwards beyond root of pectoral spine. Occipito- 

 nurhal shield rough like the occiput, obtusely tectiform, 1^ to 1| times 

 as long as broad, with pointed posterior processes. Humeral process 

 1 J to 2 times as long as broad, granulate,, keeled, extending as far back 

 as occipito-nuchal process. Dorsal I 7 ; spine f to f length of head, 

 feebly curved, striated, smooth in front, feebly serrated behind. Adipose 

 dorsal 2J to 3J times as long as broad, 2^ to 3^ times as long as its 



53 Bou I/ll 



