CHBYSICHTHYS. 



333 



times. Head much depressed, 1J to 1^ times as long as broad, rugose 

 and striated above ; occipital process rather broad, in contact Avith inter- 

 neural shield; snout broadly rounded, projecting very slightly beyond 

 lower jaw, 2 to 3 times diameter of eye, which is 6 to 9 times in length 

 of head and 2 to 5 times in interocular width ; width of mouth once 

 and \ to twice in length of head ; prsemaxillary band of teeth curved, 

 6 to 8 times as long as broad ; vomero-pterygoid teeth forming a long 

 and broad band narrowly interrupted in the middle ; nasal barbel as 



Fig. 260. 



Chrysichihys crancht 



Type. 



long as or a little longer than eye ; maxillary barbel -f to once length 

 of head ; outer mandibular barbel longer than inner, -| to f length of 

 head. Gill-rakers moderate, 10-13 on lower part of anterior arch. 

 Dorsal I 6, 1^- to 1^ times as distant from end of snout and from root 

 of caudal ; spine rugose but not serrated, about \ length of head ; 

 first and second soft rays longest, -f to § length of head. Adipose fin 

 \\ times as long as deep, its base a little shorter than or nearly equal 

 to that of the dorsal and \ or a little less than \ its distance from the 

 latter. Anal 12-14, 8-10 rays branched. Pectoral spine about \ length 

 of head, very feebly denticulate on both sides in the adult, strongly 

 serrated on inner side in the young. Caudal deeply notched, longest 

 rays 2 to 2| times the median. Caudal peduncle 1^ to \\ times as long 

 as deep. Dark brown above, white beneath. 



Total length 1000 millim. 



Congo and Lake Tauganyika. 



