316 SILURIDJE. 



anal with 9-11 branched rays; second or 



first and second soft dorsal rays longest, 



not longer than head 4. C. furcatus, Grthi - ., p. .320. 



Snout obtusely pointed, not much broader than 



long ; width of mouth 2^ to 4 times in 



length of head ; anal with 7-9 branched 



rays; second (rarely first) soft dorsal ray [p. 321. 



longest, usually at least as long as head . 5. C. nigrodiyitatus, Lacep., 

 Snout rounded, broader than long ; width of 



mouth 2 to 2§ times iu length of head ; 



anal with 7-8 branched raj's ; first or first 



and second soft dorsal rays longest, usually 



shorter than head 6. C. walkeri, Gthr., p. 321. 



B. Base of adipose fin as long as or longer than that of rayed dorsal, from 

 which it is separated by a space equal to 1^ times its length ; anal with 

 6-8 branched rays ; first soft dorsal ray longest ; 10-12 gill-rakers on 

 lower part of anterior arch. 

 First soft dorsal ray more or less produced ; 

 longest rays of caudal 2i to 3 times length 



of median 7. C. aurcdus, Geoffr., p. 325. 



First soft dorsal ray not produced ; longest ra} r s 



of caudal twice length of median ... 8. C. rueppelli, Bigr., p. 327. 



III. Dorsal 1 J, to If times as distant from root of caudal as from end of snout ; 

 band of prsemaxillary teeth feebly curved, 4 to 6 times as long as broad : 

 length of head 3^ to 3f times in total length ; maxillary barbel longer than 

 head ; nasal barbel not half diameter of eye ; width of mouth 2 to 3 times 

 in length of head ; 17-23 gill-rakers on lower part of anterior arch : anal 

 with 8-9 branched rays ; longest rays of caudal 3 to 3| times length of 

 median. 



Maxillary barbel a little longer than head . . 9. C. breviharhis, Blgr., p. 329. 

 Maxillary barbel at least 3 times length of 



head 10. C. longibarbis, Blgr., p. 330. 



IV. Dorsal not more than 1^ times as distant from root of caudal as from end 

 of snout ; band of prsemaxillary teeth curved, 4 to 8 times as long as broad; 

 length of head 3 to 3^ times in total length ; maxillary barbel not or but 

 slightly longer than head ; nasal barbel f to 2 diameters of eye ; width of 

 mouth 1% to 2 times in length of head. 



A. Base of adipose fin nearly as long as its distance from the rayed dorsal ; 

 anal with 7-9 branched rays. 

 Head 1£ times as long as broad ; first soft 



dorsal ray longest 11. C. didtoni, Blgr., p. 331. 



Head not or but little longer than broad; second 



and third soft dorsal rays longest . . . 12. C. wagenaari, Blgr., p. 3)51. 



