CIIEYS1CHTHTS. 331 



rays at least 3 times as long as median. Caudal peduncle 1J to If times 

 as long as deep. Brown above, white beneath ; a blackish spot behind 

 tbe operculum. 



Total length 390 millim. 



Upper Congo. — Type in Congo Museum, Tervueren. 



1. Hgr., type. Leopoldville. Capt. Wilvertli (C). 



2. Hgr. Dolo, Stanley Pool. M. P. Delhez (C). 



3. Ad. Monsembe, Upp. Congo. Rev. J. H. Weeks (P.). 



4. Yg. Banzyville, Ubanghi. Capt. Royaux (C). 



11. CHRYS1CHTHYS DUTTONI. 

 Bouleng. Ann. & Mag. N. H. (7) xvi. 1905, p. 641. 



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

 Head 1^ times as long as broad, with granular rugosities above; snout 

 broadly rounded, extending a little beyond lower jaw ; eye 4 times in 

 length of head, nearly equalling interorbital width ; vomero-pterygoid 

 teeth forming a long but very narrow band ; nasal barbel § diameter of 

 eye ; maxillary barbel a little longer than head, extending nearly to 

 extremity of pectoral spine. Dorsal I 6 ; spine strong, serrated behind ; 

 first soft ray longest, as long as head ; adipose fin as long as deep, its 

 base a little greater than its distance from rayed dorsal. Anal 11, 7 rays 

 branched. Pectoral spine f length of head, strongly seriated on inner 

 border. Caudal deeply notched, with rounded lobes. Caudal peduncle 

 nearly 1-| times as long as deep. Brown above, white beneath. 



Total length 1 30 millim. 



Kasai River (Congo). — Type in Congo Museum, Tervueren. 



12. CHRYSICHTHYS WAGENAARI. 



Bouleng. Ann. Mus. Congo, Zool. i. p. 39, pi. xx. tig. 1 (1899), and Poiss. Bass. 

 Congo, p. 289 (1901). 



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

 times. Head much depressed, as long as or a little longer than broad, 

 covered with thick skin above ; occipital process in contact with inter- 

 neural shield ; snout broadly rounded, projecting very slightly beyond 

 lower jaw, 1| (young) to 3 times diameter of eye, which is 4 (young) 

 to 8ij times in length of head and ]| to 4 times in interocular 

 width ; width of mouth half or more than half length of head ; prse- 

 maxillary band of teeth curved, 5 to 5i times as long as broad ; vomero- 



