396 SILURtD.?:. 



Snout 2^ times postocular part of head, tenni- 

 natiiif^ in a pointed process ; adipose 

 dorsal 1^ times as long as its distance 

 from rayed dorsal ; maxillary barbel ^ 



length of head 41. S. .viphias, Gthw, {:>. 451. 



y. Maxillary barbel 2 to 4 times length of head ; snout not or but 

 slightly longer than postocular part of head. 

 Movable mandibular teeth 40-G5 ; maxillary 

 barbel not extending beyond ventral ; 



skin villose on sides 42. S. greslwffi,^ Schilth., p. 452. 



Movable mandiblar teeth 18-25 ; maxillary 

 barbel extending far beyond ventral ; 



skin smooth 43. S. alhert'i, Schilth., ]). 454. 



b. Spine of dorsal serrated in front. 



a. Maxillary barbel without distinct margin ; adipose dorsal rather 

 small, not longer than its distance from rayed dorsal ; snout as 

 long as postocular part of head. 



Movable mandibular teeth 30-40 44. /S. hutesii, Blgr., p. 455. 



j3. Maxillary barbel broadly margined ; adipose dorsal large, 4 to 8 

 times as long as its distance from rayed dorsal ; snout longer than 

 postocular part of head. 

 Movable mandibular teeth 30-48; skin smooth. 45. S. serratus, Riipp., p. 457. 

 Movable mandibular teeth 18 ; skin villose on 



sides 46. S. geledensis, Gthr., p. 458. 



3. Humeral process rounded or broadly truncate behind ; maxillary barbel 

 more or less broadly margined at base. 

 a. Eyes supero-lateral, or nearly perfectly lateral, but not visible from 

 below. 

 a. Movable mandibular teeth 16-20. 

 Maxillary barbel a little shorter than head ; 

 adipose dorsal nmch longer than head ; 

 movable mandibular teeth barely ^ 



diameter of eye ...» 47. S. filameidosus^ Blgr., p. 4150. 



Maxillary barbel a little shorter than head ; 

 adipose dorsal a little longer than head ; 

 movable mandibular teeth nearly \ 



diameter of eye 48. S. sni'tii, Blgr.^ [i. 461. 



Maxillary barbel longer than head ; adipose 

 dorsal much shorter than liead ; movable 

 mandibular teeth barely | diameter of eye. 4D. S. uofutus, Yaill., p. 462. 



^. Movable mandibular teeth 6-12 ; adipose dorsal nearly as long as head. 

 I\Iaxillary barbel not longer than head ; movable 

 mandibular teeth not more than X diameter 

 ^, of eye 50. 6'. luiDuiti/er, Bl^r.. p. 46;>. 



