416 SILURIDJE. 



inner, both with long slender branches without ramifications, or inner 

 with a few tubercular ramifications. Gill-openings not extending 

 downwards beyond root of pectoral spine. Occipito-nuchal shield rough 

 like the occiput, obtusely tectiform, lj$ to 1^ times as long as broad, 

 with pointed posterior processes. Humeral process much longer than 

 broad, not distinctly keeled, sharply pointed, extending as far back, or 

 not quite so far back, as occipito-nuchal process. Dorsal I 7 ; spine ^ to 

 once length of head, feebly curved, striated and sharp-edged in front, 

 rather feebly serrated behind. Adipose dorsal 3 to 4^ times as long as 

 deep, 1^ to 2\ times as long as its distance from rayed dorsal. Anal 

 IV-V 7-8, obtusely pointed in front. Pectoral spine -f to once length 

 of head, not reaching ventral, outer border feebly, inner border strongly 

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

 the longer. Caudal peduncle as long as deep or a little longer than 

 deep. Brown or olive, uniform or dotted with black, or with larger 

 round black spots. 



Total length 230 millim. 



East Africa, from the Webi Shebeli to the Zambesi. — Types in Berlin 

 Museum. 



Webi Shebeli. Dr. Donaldson Smith (C). 



Ngatana, Tana R. Prof. J. W. Gregory (P.). 



Ruva It., Arusha district. F. J. Jackson, Esq. (P.). 



Pa n gam It. Sir Lambert Playfair (P.). 



Zanzibar Coast. „ 



Stream running into L.Nama- Capt. C. Percival (P.). 

 ramba, 20 m.E.of L.Nyassa, 

 3000 i't. 

 L- Nvassa. Mr. J. A. Williams ((!.). 



Prof. J. E. S. Moore (C). 

 Dr. W. A. Cunnington (0.). 

 Zambesi below Victoria Falls. Dr. J. D. F. Gilchrist (P.). 



13. SYNODONTIS NIGROMACULATUS. 

 Bouleng. Ann. & Mag. N. H. (7) xvi. 1905, p. 645. 



Depth of body equal to length of head, 4 times in total length. Head 

 l\ times as long as broad, feebly rugose above behind snout, which is 

 rounded and as long as postocular part of head; eye supero-lateral, 

 6 times in length of head, 2| times in intraorbital width ; lips moderately 

 developed ; prsemaxillary teeth forming a short and broad band ; movable 



