CHRYSICHTHYS. 317 



B. Base of adipose fin If to 3 times in ita distance from rayed dorsal. 



1. Head 1£ to 1^ times as long as broad. 



a. Width of mouth 1^ to 1| times in length of head ; 10-13 gill-rakers 



on lower part of anterior arch. 

 Caudal deeply notched; anal with 8-10 branched 



rays ; head rugose above 13. C. crancliii, Leach, p. 332. 



Caudal deeply notched ; anal with 7 branched 



rays ; head rugose above 14. C. punctatus, Blgr., p. 334. 



Caudal feebly notched ; anal with 7 branched 



rays ; head nearly smooth above . . . 15. C delhezi, Blgr., p. 335. 



b. Width of mouth twice in length of 



head; 16 gill-rakers on lower 

 part of anterior arch ; anal with 

 7 branched rays 16. C. mabusi, Blgr., p. 336. 



2. Head not more than li times as long as broad. 

 Maxillary barbel at least as long as head ; anal 



with 6-8 branched rays ; head rugose 



above ; 9-10 gill-rakers on lower part 



of anterior arch 17. C. ornatus, Blgr., p. 337. 



Maxillary barbel \ to f length of head ; anal 



with 8-10 branched rays ; head rugose 



above ; 12-20 gill-rakers on lower part of 



anterior arch 18. C. myriodon, Blgr., p. 339. 



Maxillary barbel I to \ length of head ; anal 



with 8-9 branched rays ; head smooth 



above; 13-18 gill-rakers on lower part of 



anterior arch 19. C. braclvynema, Blgr., p. 340. 



1. CHRYSICHTHYS SIANENNA. 

 Bouleng. Trans. Zool. Soc. xvii. 1906, p. 551, pi. xxxii. fig. 2. 



Depth of body 5| to 6 times in total length, length of head 4 J times. 

 Head moderately depressed, If to 1J times as long as broad, smooth 

 above; occipital process narrow, narrowly separated from the small 

 interneural shield; snout rounded, projecting a little beyond lower jaw, 

 ^ length of head ; eye 4 to 4| times in length of head, 1 to 1^ 

 times in interorbital width ; width of mouth about \ length of bead ; 

 pnemaxillary band of teeth curved, 6 times as long as broad ; vomero- 

 pterygoid teeth forming a long and narrow crescentic band ; nasal 

 barbel \ diameter of eye ; maxillary barbel 1\ to 1^ times length of 

 head; outer mandibular barbel nearly twice as long as inner and -§• 

 length of head. Gill-rakers long and closely set, 18 to 20 on lower part 

 of anterior arch. Dorsal I 6, rather small, nearly twice as distant from 



