430 SILUEID.E. 



tubercular branches. Gill-opening not extending downwards beyond 

 root of pectoral spine. Occipito-nuchal shield rugose like the occiput, 

 convex or obtusely tectiform, 1^ to IJ times as long as broad, posterior 

 processes pointed or truncate. Humeral process much longer than 

 broad, distinctly keeled, sharply pointed, extending as far as, and 

 usually beyond, occipito-nuchal process. Dorsal I 7 ; spine straight or 

 feebly curved, j to once length of head, smooth in front, serrated 

 behind. Adipose dorsal 2| to 3 times as long as deep, 1| to 2 times as 

 long as its distance from rayed dorsal. Anal IV 8-9, rounded. 

 Pectoral spine J to once length of head, feebly serrated on outer edge, 

 strongly on inner. Ventral reaching anal or not quite so far. Caudal 

 deeply forked, upper lobe slightly the longer. Caudal peduncle as long 

 as deep or a little longer. Brown or olive to blackish, with more or 

 less numerous round black spots ; fins greyish to blackish, caudal with 

 transverse series of black spots or with black cross-bars. Young brown, 

 with two or three irregular wavy, dark-edged light bands on the caudal 

 portion of the body, and spotted all over with blackish, the spots some- 

 times forming cro«s-bands; alight, dark-edged streak from eye to end 

 of snout ; belly brown, with round darker spots ; caudal fin whitish, with 

 3 to 5 very regular black transverse bands. 



Total length 170 millim. 



White Nile, Bahr-el-Gebel, Senegal, Gambia, Niger. — Type in Paris 

 Museum. 



1-10. Ad., hgr., & yg. Fiisboda, White Nile. L. Loat, E.sq. (C). 



11. Yg. Polkoiii, Baro R. (Sobat). Mr. P. C. Zapliiro (C); 



W.N.McMillan,E^q.(P.). 



12-13. Ad. Tonga, White Nile. L. Loat, Esq. (0 ). 



14. Ad. Gondokoro, Bahr-el-Gcbel. „ 



15. Ad. Wadelai, Albertine Nile. J. S. Budgett, Esq. (P.). 

 IG. Yg. Kacdi, Senegal. M. P. Delhez (C). 

 17-19. Ad. MeCartliy Id., Gamliia. J. S. Budgett, Esq. (P.). 

 20. Skel. „ 



21-23. Ad. Assay, Low. Nig(!r. „ 



Synodontis Jiumeratus, Cuv. & Val. op. cit. xv. p. 264, is based on a 

 coloured figure made by Rifaud in Upper Egypt. It appears to 

 represent a fish similar to S. nigrita, but the short spine of the dorsal 

 fin, serrated in front as well as behind, precludes its ideutitication with 

 that species. 



