SYNODONTIS. 47 [ 



reaching origin of anal or a little beyond. Caudal deeply forked, 

 upper lobe the longer. Caudal peduncle as long as deep or a little 

 deeper than long. Grey to dark green above, white beneath; fins 

 greyish white, caudal often tinged with red. Young with dark mavblings 

 on the body and round dark spots on the ventral, anal, and caudal fins. 



Total length 270 millim. 



Nile, Chad Basin, Senegal, Gambia, Niger. 



Dr. Riippell (C). 

 L. Loat, Esq. (C). 



Mr. P. C. Zaphiro (0.) ; 



W.N. McMillan, Esq. (P.). 

 L. Loat, Esq. (C). 



Oapt. G. B. Go-ling (P.). 

 J. S. Budgett, Esq. (P.). 

 Mr. J. Paul Arnold (P.). 



55. SYNODONTIS 11ESUPINATUS. 

 Bouleng. Proc. Zool. Soc. 1904, i. p. 199, pi. viii. 



Depth of body 2^ times in total length, length of head 4 times. 

 Head 1J times as long as broad, deeper than broad, feebly rugose above 

 from between the eyes ; snout rounded, as long as postocular part of 

 head; eye supero-lateral, its diameter 4 times in length of head, 1^ 

 times in interorbital width. Mouth narrow, with strongly developed 

 lips, forming a lobe on each side ; pra?maxillary teeth very small, villiforra, 

 forming a broad band ; movable mandibular teeth about j diameter of 

 eye, about 60 in number. Maxillary barbel slightly longer than head, 

 its basal third with a broad marginal membrane on the inner side and a 

 series of short obtuse branches, some of which are knob-like, on the 

 outer side ; mandibular barbels with long tuberculate branches, outer 

 -i length of head, inner ^. Gill-opening not extending downwards 

 beyond root of pectoral spine. Occipito-nuchal shield feebly rugose 

 like the occiput, obtusely tectiform, nearly twice as long as broad, with 

 obtuse posterior processes. Humeral process longer than broad, flat, 

 granulate, obtusely pointed, not extending quite so far back as occipito- 



