CIIRYS1CHTHTS. 331 



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

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

 the operculum. 



Total length 390 millim. 



Upper Congo. — Type in Congo Museum, Tervueren. 



1. Hcrr., type. Leopoldville. Capt. Wilverth (0.). 



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



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



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



11. CHRYSIGHTHYS DUTTONI. 

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



Depth of body 4^ times in total length, length of head of 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 ; 

 fii st 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, Trays 

 branched. Pectoral spine -J 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 130 millim. 



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



12. CHRYSIGHTHYS WAGENAARI. 

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

 Congo, p. 289 (1901). 

 Depth of body 4 to 4 J 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 8-| times in length of head and 1| to 4 times in interocular 

 width ; width of mouth half or more than half length of head ; pra?- 

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



