SYNODONTIS. 439 



35 in number. Maxillary barbel without marginal membrane, lj to 1^ 

 times length of head, reaching middle or posterior third of pectoral 

 spine ; outer mandibular barbel 2 to 3 times as long as inner, former 

 with long, slender branches, latter with shorter branches with tubercular 

 ramifications. Gill-opening not extending downwards beyond root of 

 pectoral spine. Occipito-nuchal shield granulate, simply convex, I3- to 

 1^ times as long as broad, with posterior processes acutely or obtusely 

 pointed. Humeral process much longer than broad, keeled, sharply 

 pointed, extending as far back as occipito-nuchal process. Skin feebly 

 villose on sides. Dorsal I 7 ; spine about § length of head, nearly 

 straight, striated, sharp-edged in front, very feebly serrated behind. 

 Adipose dorsal 3| to i.\ times as long as deep, 2 to 3^ times as long as 

 its distance from rayed dorsal. Anal III 7-8, obtusely pointed in front. 

 Pectoral spine as long as head, not reaching ventral, strongly serrated on 

 both sides, especially behind. Caudal deeply forked, upper lobe usually 

 the longer. Caudal peduncle not longer than deep. Uniform brownish ; 

 young with dark marblings, black spots on the fins, and a black streak 

 along each lobe of the caudal. 



Total length 210 millim. 



Congo. — Types in Congo Museum, Tervueren. 



1-2. Two of the types. Leopoldville. Capt. Wilverth (C). 



3. Yg. Bumba E. (affl. of Sanga E.) G. L. Bates, Esq. (C). 



at Assobam, S. Cameroon. 



31. SYNODONTIS THOLLONI. 



Synodontis robbianus (non Smith), Vaill. N. Arch. Mus. (3) viii. 1896, p. 14-1. 

 Synodorttis tholloni, Bouleng. Poiss. Bass. Con#o, p. 304 (1901). 



Depth of body nearly equal to length of head, 3J times in total 

 length. Head rugose, granulate above ; snout a little more than \ length 

 of head, rounded ; eye supero-lateral, 5 times in length of head, twice 

 in interorbital width ; lips moderately developed ; praemaxillary teeth 

 forming a short and broad band; movable mandibular teeth about \ 

 diameter of eye, about 30 in number. Maxillary barbel not margined, 

 longer than head, extending to middle of pectoral spine ; mandibular 

 barbels with short branches. Gill-opening not extending downwards 

 beyond root of pectoral spine. Occipito-nuchal shield tectiform, with 

 granular asperities, the posterior processes rounded. Humeral process 

 2| times as long as broad, feebly keeled, obtusely pointed. Dorsal I 7 ; 



