1066 MK. G. A. BOULENGER ON [DeC. 10, 



Synopsis of the Sj^ecies. 



I. Ventral fins midway between end of snout and root of caudal, or a little 

 nearer (less than j) the former ; nasal barbel shorter than head *. 



A. Maxillary barbel not or but little longer than head, except in the very 



young ; at least 20 gill-rakers on anterior arch. 



1. Length of head 3 to 3f times in total length f ; vomerine teeth forming an 



uninterrupted or scarcely interrupted band or patch ; distance between 

 occipital process and dorsal fin at least 4 times in length of head. 

 a. Head granulate above, except in the very young ; D. 62-82; A. 46-65. 

 a. Vomerine teeth mostly pointed or granular-subconical, forming a 

 band which is not broader than the band of prsemaxillary teeth ; 

 distance between occipital process and dorsal fin 4 to 7 times in 

 length of head. 

 20-27 gill-rakers on anterior arch ; distance between 



dorsal and caudal 1-1| diameters of eye 1. C. anguillaris L. 



40-oO gill-rakers on anterior arch ; distance between 



dorsai and caudal 1-2 diameters of eye 2. C. gariepinus Burcli. 



87 gill-rakers on anterior arch ; distance between 



dorsal and caudal 3 diameters of eye 3. C. nioorii Blgr. 



|3. Vomerine teeth all or mostly granular, forming a crescentic band with 

 or without posterior process. 

 • 30-40 gill-rakers on anterior arch ; band of vomerine 

 teeth as broad as or a little narrower than band of 

 prtemaxillary teeth; head not more than If as 



long as broad, 4^7 times its distance from dorsal.. 4. C. senegalensis C. & V. 

 25 (in very young)-110 gill-rakers on anterior arch : 

 band of vomerine teeth nearly 1 to 1^ as broad as 

 praemaxillary band ; head not more than If as long 



as broad, 4-7 times its distance from dorsal 5. C. mossavibicus Peters. 



90 gill-rakers on anterior arch ; band of vomerine 

 teeth as broad as praimaxillary band ; head If as 



long as broad, 9 times its distance from dorsal ... 6. C. vincicfiierrcB Blgr. 

 35 (in very young)-135 gill-rakers on anterior arch ; 

 band of vomerine teeth li to 2^ times width of 

 praemaxillary band ; head not more than If as long 



,; as broad, 4-7 times its distance from dorsal 7. C. lazera C. & V. 



y. Vomerine teeth granular, forming a 

 large semi-elliptic patch, squarely 

 truncate behind, its longitudinal 

 diameter 3 times that of praemaxil- 

 lary band ; 35 gill-rakers on anterior 

 arch; distance between dorsal and 



caudal 5 length of head 8. C. meUandi Hlgr. 



h. Head smooth above ; D. 78-85, A. 60-70; 

 vomerine teeth granular, forming a 

 band which is not broader than prae- 

 maxillary band; 45-70 gill-rakers on 

 anterior arch; distance between dorsal 

 and caudal not greater than diameter of 

 eye 9. C tsanensis Blgr. 



2. Length of head 4 times in total length ; 



vomerine teeth mostly granular, forming 

 a band which is a little narrower than the 

 praemaxillary band and interrupted in the 

 middle ; head granulate above ; D. 63-72, 

 A. 50-52 ; distance between occipital pro- 

 cess and dorsal f-rf length of head; 55 

 gill-rakers on anterior arch 10. C. caj>ensis C. & V. 



B. Maxillary barbel IJ length of head ; 12 gill- 



rakers on anterior arch ; head feebly granu- 

 late above, \\ as long as broad ; vomerine 

 teeth conical ; D. 65-70, A. 56-62 11. C. platycepJiahis Blgr. 



* The head is measured to the extremity of the occipital process. 

 t Caudal fin not included. 



