CHRYSICllTHTS. 



333 



tlmev«?. Head much depressed, 1:| to 1^ times as long as broad, ru<i^ose 

 and striated above ; occipital process rather broad, in contact with 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 "i to twice in length of head ; prgemaxillary band of teeth curved, 

 G 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. 



Chrysich thi/fi era a eh il. 

 Tjpe. i. 



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-rakeis moderate, 10-13 on loAver part of anterior arch. 

 Dorsal 1 6, !ig^ to 1^ times as distant from end of snout and from root 

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

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

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

 to tliat of the dorsal and ^ or a little less than ^ its distance from the 

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

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

 serrated on inner side in the young, ('audal deeply notched, longest 

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

 as deep. Dark brown above, white beneath. 



Total length 1000 millim. 



Congo and i^ake Tanganyika. 



