CIIEYSICHTHYS. 331 



rays at least 3 times as long as median. Caudal peduncle 1^ 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. Hyr., ty[je. Leopoldville. Capt. Wilverth (C). 



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



3. Ad. Monseiube, Upp. CJongo. Kev. J. H. Weeks (P.). 



4. Yg. Banzyville, Ubaughi. Cypt. Royaux (C-.). 



11. CHRYSICHTHYS DUTTONI. 

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



Deptli of body 4J times in total length, length of head 3| 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 vsoft 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 serrated 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 lliver (Congo). — Type in Congo Museum, Tervueren. 



12. CHRYSICHTHYS WAGENAARI. 



Boulong. Ann. Mus. Congo, Zool. i. p. o9, pi. xx. Hg. 1 (1899), and Poiss. Bass. 

 Congo, p. 289 (1901). 



Depth of body 4 to 4 J- times in total len<2th, length of head 3 to 3J 

 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, IJ (young) to 3 times diameter of eye, which is 4 (young) 

 to 8^ times in length of head and IJ 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 oh times as long as broad ; vomero- 



