CIIRYSICHTHYS. 



339 



18. CHRYSICHTHYS MYRIODON. 



Bouleng. Ann. Mus. Congo, Zool. i. p. 139, pi. li. (1900), Poiss. Bass. Congo, 

 p. 284 (1901), and TV. Zool. Soc. xvi. 1901, p. 147. 



Depth of body 4J to 5 times in total length, length of head 3^ to 3J 

 times. Head much depressed, 1^ to lj times as long as broad, rough 

 on vertex and occiput; occipital process in contact with interneural 

 shield ; snout broadly rounded, scarcely projecting beyond lower jaw, 

 ^ length of head ; eye 3J (young) to 6 times in length of head, 1^ (young) 

 to 1\ times in interocular width ; width of mouth If to 2 times in length 

 of head ; praemaxillary band of teeth nearly straight, 6 to 7 times as long 



Fig. 265. 



Ghrysichthys myriodon. 

 Type (A. M. C). \. 



as broad ; vomero-pterygoid teeth very fine and closely set, forming a 

 long and broad uninterrupted band in the adult (narrower and slightly 

 interrupted in the middle in the young), strongly widening posteriorly ; 

 nasal barbel f to f diameter of eye ; maxillary barbel \ to \ length of 

 bead ; inner mandibular barbel \ length of head, outer a little less 

 than i. Gill-rakers 12 (young) to 20 on lower part of anterior arch. 

 Dorsal I 6, once and I as distant from root of caudal as from end of 

 snout ; spine nearly | length of head, rugose, not serrated ; first and 

 second soft rays longest, about f length of head. Adipose fin longer 

 than deep, its base | that of the dorsal and i to | its distance from the 

 latter. Anal 12-14, 8-10 rays branched. Pectoral spine a little longer 

 and stronger than dorsal, strongly serrated on inner side. Caudal 



z2 



