SYKODONTIS. 



405 



processes pointed or truncate. Humeral process much longer than 

 broad, very obtusely keeled, the keel sometimes very indistinct, sharply 

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

 more or less villose on sides. Dorsal I 7 ; spine j- to slightly over once 

 length of head, straight or curved, striated and sharp-edged or very finely 

 granulate in front, feebly serrated behind. Adipose dorsal 3 to 4-| times 

 as long as deep, 2^ to 4J times as long as its distance from rayed dorsal. 

 Anal IV 8-9, obtusely pointed in front. Pectoral spine as long as or 

 slightly longer or a little shorter than that of dorsal, rarely reaching 

 root of ventral, outer border very finely, inner border strongly serrated. 



Tiff. 306. 



Synodontis schall. 

 Lower Nile (P. N.). %. 



Ventral usually not reaching anal. Caudal deeply forked, upper lobe 

 the longer, sometimes prolonged into a filament. Caudal peduncle as 

 long as deep or deeper than long. Grey, brown, or olive above, white 

 beneath : adults uniform, with the paired fins and the anal sometimes 

 blackish ; half-grown with very numerous dark dots ; young handsomely 

 marbled and spotted, with wavy and oblique bands of yellowish, and two 

 or three more or less regular yellowish streaks along the snout. 



Total length 410 millim. 



Nile; Lakes Abaia, Stephanie, and Rudolf; Chad Basin ; Senegal. 



1-2. Ad. Lower Nile. J. Petherick, Esq. ((.'.). 



3. Skel. 



