CHRYSTCHTHYS. 317 



B. Base of adipose (in 1| to 3 times in its 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, 

 ('audal deeply notched; anal with 8-10 branched 



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



Caudal deeply notched ; anal with 7 branched 



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



Caudal feebly notched ; anal with 7 branched 



rays ; head nearly smooth above . . . 15. ^7. delltezi, 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. mabmi, Blgr., p. 336. 



2. Head not more than 1^ times as long as broad. 

 Maxillary barbel at least as long as head ; anal 



with 'o-'6 branched rays ; head rugose 



above; 9-10 gill-rakers on lower part 



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



Maxillary barbel -^ to | 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 ^ 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. brachi/nema, Blgr., p. 340. 



1. CHRYSICHTHYS SIANENNA. 

 Boiileng. 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^ times. 

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

 above; occipital process narrow, narrowly separated from the small 

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

 ^ length of head; eye 4 to 4^ t^mes in length of head, 1 to 1^ 

 times in interorbital width ; width of mouth about -j length of head ; 

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

 pterygoid teeth forming a long and narrow crescentic band ; nasal 

 barbel -g- 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, (lill-rakers long and closely set, 18 to 20 on lower part 

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



