222 SILUEID.E. 



Synopsis of the Species. 



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

 (less than ^) 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 3| times in total length f ; vomerine teeth forming 

 an uninterrupted or scarcely interru[)ted band or patch ; distance 

 between occij)ital process and dorsal fin at least 32 times in length of 

 head. 

 a. Head granuhite above (under the skin), except in the very young; 

 D. G2-82, A. 4G-65. 

 a. Vomerine teeth mo-tly })ointed or granuLir-subconical, forming a 

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

 distance between occipital j)rocess and dorsal fin 3^ to 7 times in 

 length of head. 

 20-27 gill-rakers on anterior arch ; distance 

 between dorsal and caudal 1-2| diameters 



of eye 1. C loiguillaris, L., p. 22G. 



25 (in very young)-80 gill- rakers on anterior 

 arch ; distance between dorsal and caudal 



1^-2 diameters of eye 2. C. //a/vV/>//H/s, Burch., p. 228. 



87 gill-rakers on anterior arch ; distance be- 

 tween dorsal and caudal 3 diameters of eye. 3. C moom, Blgr., p. 230. 



/3. Vomerine teeth all or nioslly 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 prciemaxillary teeth; 



head not more than If times as long as 



broad, 4-7 times its distance from dorsal. 4. C. senn/aJensis, L\ & V., j). 231. 

 25 (in very young)-100 gill-rakers on anterior 

 arch ; band of vomerine teeth nearly 1 to 

 1^ times as broad as praemaxillary band ; 

 head not more than 1§ times as long as 



l)road, 4-7 times its distance from dorsal. 5. C mosmmJ>iciis, Peters, p. 232. 

 90 gill-rakers on anterior arch ; band of vo- 

 merine teeth as broad as pnemaxillary 

 band ; head If times as long as broad, 9 

 times its distance from dorsal . . . . G. C vtnnjuernv, BIgr., p. 234. 



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

 t Caudal fiu not included. 



