336 SILUEIDvE. 



in length of head and 2 to 2-g- times in interocular width ; width of mouth 

 once and § in length of head ; preemaxillary band of teeth curved, 4J to 

 7 times as long as broad ; vomero-pterygoid teeth forming a long and 

 broad band, nearly continuous or narrowly interrupted in the middle, its 

 width a little less than that of the prsemaxillary band in the adult ; nasal 

 barbel 1^ to 1^ diameters of eye ; maxillary barbel \ to § length of 

 head ; outer mandibular barbel nearly twice as long as inner, \ to -§• 

 length of head. Gill-rakers moderate, 10 on lower part of anterior arch. 

 Dorsal I 6, slightly nearer end of snout than root of caudal ; spine short, 

 not serrated ; first and second soft rays longest, about \ length of head. 

 Base of adipose fin a little shorter than that of dorsal, from which it is 

 separated by a space equal to 2 to 3 times its base. Anal 11, 7 rays 

 branched. Pectoral f to § length of head ; spine strongly serrated on 

 inner border. Caudal rounded, very feebly emarginate in the adult, 

 more deeply (median rays f length of outer) in the young. Caudal 

 peduncle \\ to 1J times as long as deep. Dark brown above, white 

 beneath. 



Total length 270 niillim. 



Congo. — Type in Congo Museum, Tervueren. 

 1. Hgr. Upper Congo. Brussels University. 



16. CHRYSIOHTHYS MABUSI. 

 Bouleng. Ann. & Mag. N. H. (7) xvi. 1905, p. 045. 



Depth of body 4^ times in total length, length of head 3 \ times. 

 Head strongly depressed, \\ times as long as broad, with feeble granular 

 rugosities above; occipital process broad, in contact with interneural 

 shield ; snout broadly rounded, twice as long as eye, which is 6 times in 

 length of head and 2 \ times in interorbital width ; mouth inferior, its 

 width \ length of head ; prsemaxillary band of teeth curved, G times as 

 long as broad ; vomero-pterygoid teeth forming a long but narrow band, 

 narrowly interrupted in the middle ; nasal barbel nearly as long as eye ; 

 maxillary barbel \ length of head ; outer mandibular barbel \\ times as 

 long as inner, ■§■ length of head. Gill-rakers rather long, 16 on lower 

 part of anterior arch. Dorsal I 6, equally distant from end of snout and 

 from root of caudal ; spine strong, serrated behind, § length of head ; 

 second soft ray longest, a little shorter than head. Base of adipose 

 fin f- that of dorsal, from which it is separated by a space equal to 

 2J times its base. Anal 11, 7 rays branched. Pectoral spine \ length of 



