474 SILUEID.E. 



shield rough like the occiput, obtusely tectiform, 1| to 2 times as long 

 as broad, posterior processes pointed or rounded. Humeral processes 

 about as long as broad, flat, granulate, pointed or obliquely truncate 

 posteriorly, not extending so far back as occipito-nuchal process. Dorsal 

 I 7 ; spine strong, straight or feebly curved, smooth in front, feebly 

 serrated behind, about as long as head, the soft terminal part produced 

 into a short filament. Adipose dorsal 2J to 4 times as long as deep, 

 originating immediately behind rayed dorsal. Anal V 7-9, pointed. 

 Pectoral spine as long as or a little longer than dorsal, not reaching base 

 of ventral, outer border feebly, inner strongly serrated. Ventral acutely 

 pointed, reaching origin of anal, or not quite so far. Caudal deeply 

 forked. Caudal peduncle as long as deep or a little deeper than long. 

 Yio6y and adipose dorsal fin silvery grey to dark purplish ; lower parts 

 dark brown to black ; barbels blackish ; fins grey, ventrals, anal, and 

 caudal with round black spots ; iris brown ; young with large dark spots, 

 separated by a network of the light ground-coloui-, the spots on the fins 

 larger and confluent into cross-bands. 



Total length 240 millim. 



Nile, Chad Basin, Senegal, Gambia. 



1-3. Yg. South of Khartum. dipt. S. Flower (P.). 



4-10, 11-14. Fashoda, White Nile. L. Loat, Esq. (C). 



Hgr. & yg. 



15-20. Ad. & jg. Mouth of L. No, White Nile. 



21. Skel. „ 



22. Yg. P>ahr-el-aebel. Lieut. Drury (C). 



23. Ad. Gondokoro, Bahr-el-Grebel. L. Loat, Esq. (C). 



24. Ad. K. Sh.iri-Wasu at Maidunari. Capt. G. B. Gosling (P.). 

 '25-2{:,. Ad. & ligr. McCarthy !d., Gambia. J. S. Budgett, Esq. (P.). 



57. SYNODONTIS MEMBKANACEUS. 



J'lmchxhis meiuhrartaceiis, Geoffr. Descr. Egypte, Poiss. ])1. xiii. figs. 1 & 2 (1809). 

 Synodontis memhranaceus, part., 1. Geoffr. op. cit. p. 297 (1827) ; (Juv. & Val. 



Hist. Poiss. XV. p. 258 (1840) ; Steind. Sitzb. Ak. Wien, Ixi. i. 1870, p. 5oG. 

 Il.inisynodontis memhranaeeus, Bleek. Nat. Tijdschr. Dierk. i. 18()3, p. 55. 

 K<ynodo)itis memhranaeeus, Giinth. Gat. Fish. v. p. 215 (l-'^tSl), and Petlierick's 



Trav. ii. p. 23G (I8(;it) ; Steind. Sitzl). Ak. Wien, Ixxxiii. i. 1881, p. 200 ; 



Bouleng. Ann. & Msig. N. H. (7) viii. 1901, p. 12, and Fish. Nile, p. 383, 



pi. Ixxv. (1907). 

 Synodonlis riiienflieri, Vaill. Bull. See. Pliiloni. (8) v. 1892, p. 10, and N. Arch. 



Miis. (3) viii. 189('), [.[i. 104 & 107. 



