366 silueid^:. 



or wavy cross-bands and round blackish spots ; fins grey, with transverse series of 

 black spots sometimes forming cross-bars. 



Total length 145 millimetres. 



This species appears to be confined to Lake Victoria. The type, preserved in the 

 Berlin Museum, was obtained by the late Dr. G. A. Fischer. The specimen from the 

 Kingani River mentioned by Pfeffer lacks the villosities on the sides of the body 

 and therefore belongs no doubt to a distinct species. Vaillant's S. afro-fischeri 

 from the Congo I have already referred to S. greshoffi, Schilthuis. 



I have examined a specimen presented by Sir Harry Johnston to the British 

 Museum in 1901. and about 30 collected at Buganga and Bunjako by Mr. Degen, 

 in November 1905. 



6. SYNODOMTS NIGMTA. 

 (Plate LXXI. fig. 1.) 



Cuvier & Valenciennes, Hist. Poiss. xv. p. 265, pi. ccccxli. (1840) ; Giinther, Cat. Fish. v. p. 214 

 (1864) ; Steindachner, Sitzb. Ak. Wien. lxi. i. 1870, p. 535 ; Vaillant, N. Arch. Mus. (3) viii. 

 1896, p. 149, & vii. pi. xiii. fig. 1. 



Hemisynodontis nigrita, Bleeker, Nederl. Tijdschr. Dierk. i. 1863, p. 55. 



Body moderately compressed, its depth three to three and three-fourths times in the 

 total length, the length of the head three to three and a half times. Head once and 

 one-fifth to once and one-fourth as long as broad, as broad as or a little broader than 

 deep, rugose, granulate above from between the eyes ; snout rounded, as long as the 

 postocular part of the head ; frontal fontanelle rather large ; eye supero-lateral, its 

 diameter four to five and one-third times in the length of the head, once and a half 

 to twice and a half in the width of the interorbital region, which is flat or slightly 

 convex ; occiput simply convex. Mouth with moderately developed lips ; prsemaxillary 

 teeth forming a short and broad band ; movable mandibular teeth not more than 

 half the length of the eye, 30 to 35 in number. Maxillary barbel with a rather 

 broad marginal membrane in its basal third, once to once and two-thirds the length 

 of the head, reaching between the anterior and the posterior fourth of the pectoral 

 spine ; mandibular barbels with short, tubercular branches *, inserted on a straight 

 transverse line, the outer about twice as long as the inner. Gill-openings not 

 extending downwards beyond the root of the pectoral fin. Occipito-nuchal shield 

 rugose like the occiput, convex or obtusely tectiform, once and one-fourth to once and 

 a half as long as broad, the posterior process pointed or truncate. Humeral process 



* These are not correctly represented on Vaillant's figure; Valenciennes's, executed from the same 

 specimen, is much better iu this respect. 



