330 SILUEID-E. 



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

 once and § in length of liead ; prsemaxillary band of teeth curved, 4^ to 

 7 times as h)ng 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 praemaxillary 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 f 

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

 ])orsal 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 f 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 1^ to Ih times as long as deep. Dark brown above, white 

 beneath. 



Total length 270 millim. 



Congo. — Type in Congo Museum, Tervueren. 

 1. Hot. Upper C^oiigo. Brnsspls University. 



16. CHRY8ICHTHYS MABUST. 

 Bonleng. Ann. & Mao-. N. H. (7) xvi, IDO.'), p. Oi'j. 



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

 Head strongly depressed, 1^ 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 ; pnrmaxillary band of teeth curved, G times as 

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

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

 maxillary barbel ^ length of head ; outer mandibular barbel 1^ times as 

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

 part of anterior arch. Dorsal 1 G, 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 tiiau head. Base of adipose 

 fin § that of dorsal, from whicli it is s{^i)arated by a S])ace equal to 

 2^ times its base. Anal 11, 7 rays branched. Pectoral spine ^ lengtJi of 



