404 SILUMDJE. 



behind. Adipose dorsal 3 times as long as deep, 3^ times as long as its 

 distance from rayed dorsal. Anal V 7, pointed in front. Pectoral 

 spine as long as head, strongly serrated on both sides. Ventral 

 reaching origin of anal. Caudal deeply forked, both lobes produced 

 into a filament. Caudal peduncle as long as deep. Uniform brown. 



Total length 340 millim. 



Niger. 

 1. Tvjm-. Lokoja, Upp. Niger. J. S. Budgett, Esq. (IV). 



6. SYNODONTIS SCHALL. 



Sdiall, Sonnini, Voy. Egypt*-, ii. p. 278, pi. xxi. fig. 2 (1799). 



Silums .xrhall, Bloch-Schneid. Syst. Ichtli. p. 385 (1801). 



Pimelodus rlarias, Geoffr. Descr. Egypte, Poiss. pi. xiii. figs. 3 & 4 (1809). 



Synodontis clarias, I. Geoffr. op. cit. p. 316 (1827). 



Synodontis maadusus, Hupp. Besclir. n. Fische Nil, p. 10, pi. iii. fig. 1 (1829). 



Synodontis arabi, Cuv. & V;il. Hist. Poiss. xv. p. 261 (1840). 



Synodontis schall, Hyrtl, Denkschr. Ak. Wien, xvi. 1859, p. 16 ; Gunth. Cat. Fish. 



v. p. 212 (1864), and Petherick's Truv. ii. p. 235 (1862) ; Steind. Sitzb. Ak. 



Wien, lxi. i. 1870, p. 533 ; Vaill. N. Arch. Mus. (3) viii. 1896, p. 121, & vii. 



pi. x. fig. 7 ; Gunth. Proc. Zool. Soc. 1896, p. 221, fig. ; Pt'eff. Thierw. 



O.-Afr., Fische, p. 36 (1896) ; Vincig. Ann. Mus. Geneva, (2) xix. 1898, 



p. 246 ; Bouleng. Ann. & Mag. N. H. (7) xvii. 1906, p. 566, and Fish. Nile, 



p. 353, pi. lxiv. (1907). 

 ITemi synodontis schall, Bleek. Nederl. Tijdschr. Dierk. i. 1863, p. 55. 

 Ijeio.it/nodontis maculosus, Bleek. 1. c. 

 Synodontis smithii, Gunth. Proc. Zool. Soc. 1896, p. 222, pi. ix. ; Vincig. 1. c. 



Depth of body 3 to 4 times in total length, length of head 3-^ to 4 

 times. Head 1-g- to If times as long as broad, little broader than deep, 

 rugose above behind snout, which is rounded and as long as or shorter 

 than postocular part of head ; eye supero-lateral, 4j (young) to 8 times 

 in length of head, If to 2j times in interorbital width ; lips moderately 

 developed ; praemaxillary teeth forming a short and broad band ; 

 movable mandibular teeth not more than ^ diameter of eye, 24 to 36 

 in number. Maxillary barbel with a narrow marginal membrane at 

 base, |- to 1| times length of head, reaching between base and posterior 

 fifth of pectoral spine ; outer mandibular barbel about twice as long as 

 inner, former with long, slender branches, latter with shorter branches, 

 with tubercular ramifications. Gill-openings not extending downwards 

 beyond root of pectoral spine. Occipito-nuchal shield rough like the 

 occiput, obtusely tectiform, li to 2 times as long as broad, with posterior 



