CLARIAS. 225 



Length of head 4-4|- times in total ; maxillary 

 barbel 2-2£ length of head ; 17-22 gill- 

 rakers on anterior arch; D. 78-87, A. 55-67. 21. C. bythipogon, Sauv., p. 252. 

 Length of head 4-4| times in total ; maxillary 

 barbel IJ-lf length of head; 14-15 gill- 

 rakers on anterior arch ; D. 65-78, A. 55- 

 62 ; occipital process much longer than 



broad 22. C. alluaudi, Blgr., p. 253. 



Length of head 4^-5 times in total ; maxillary 

 barbel 1J-2 length of head ; 16-18 gill- 



rakers on anterior arch; D.82-91,A.68-72. 23. C. loerneri, Blgr., p. 25-4. 

 b. Vomerine teeth granular, in a fan- 

 shaped patch ; length of head 4 

 times in total ; maxillary barbel 

 1£ length of head; 16 gill- 

 rakers on anterior arch ; D. 80, 



A. 63 24. C. macromystaw, Grthr., p. 256. 



2. Nasal barbel shorter than head. 



a. Length of head 3^—4^ times in total ; distance between occipital 



process and dorsal §-§ length of head ; D. 60-72, A. 44-55. 

 Pectoral spine strongly serrated on both sides ; 



12-15 gill-rakers on anterior arch . . .25. C. dunierilii, Stdr., p. 257. 

 Pectoral spine feebly serrated ; 20 gill-rakers 



on anterior arch 26. C liberiensis, Stdr., p. 258. 



b. Length of head 4§-5£ times in total ; A. 68-80 ; 15-20 gill-rakers 



on anterior arch. 

 Head lf-lj as long as broad ; nasal barbel 



f-f length of head ; D. 92-95 . . . .27. C. pachynema, Blgr., p. 259. 

 Head 1^-1^ as long as broad ; nasal barbel 



\-% length of head ; D. 79-87 . . . . 28. C. Iceviceps, Gill, p. 260. 



0. Dorsal and anal embracing or adnate to base of caudal ; maxillary barbel 

 *— 11 length of head. 

 1. Head 1^—1 J times as long as broad. 

 Length of head 4 times in total ; ventrals a 



little nearer end of snout than caudal; 



D. 55, A. 50 ; pectoral spine not serrated 



on outer side 29. C. buetlikoferi, Stdr., p. 261. 



Length of head 5 times in total ; distance 



between ventrals and caudal 1\ that be- 

 tween ventrals and end of snout ; D. 80, 



A. 65 ; 15 gill-rakers on anterior arch; 



pectoral spine serrated on both sides . . 30. C. amplexicauda, Blgr., p. 261. 



VOL. II. Q 



