SYNODONTIS. 397 



Maxillary barbel not more than ^ length of 

 head ; movable mandibular teeth at least 

 as long as eye 51. aS. sojv.r, Gthr., p. 465. 



h. Eyes perfectly lateral, visible from below as well as from above ; 

 movable mandibular teeth 12-19 ; adipose dorsal shorter than head. 

 Maxillary barbel shorter than head .... 52. S. pleurops, Blgr., p. 466, 



II. Maxillary barbel branched ; gill-opening not extending downwards beyond 

 base of pectoral spine. 

 Movable mandibular teetl* 4-11 ; maxillary 



barbel not margined, with short branches ; 



adipose dorsal as long as its distance from 



rayed dorsal 53. S. decorns, Blgr., p. 468. 



Movable mandibular teeth 6-9 ; maxillary 



barbel with a distinct marginal membrane 



at base nnd with long, slender, finely 



tuberculate branches ; adipose dorsal much 



longer than its distance from raj^ed dorsal. 54. S, clar'ias, L., p. 469. 

 Movable mandibular teeth 60 ; maxillary 



barbel with a broad marginal membrane 



and short, obtuse branches ; adipose dors;d 



nearly touching rayed dorsal 55. S. resiipinatus, Blgr., p. 471. 



III. Maxillary barbel not branched, but broadly margined ; gill-opening extend- 

 ing downwards beyond base of pectoral spine ; adi[iose dorsal touching 

 rayed dorsal. 

 Gill-openings widely separated ; mandibular 



barbels branched but not margined ; 



movable mandibular teeth 30-57 . . . 56. S. hatensoda, Riijip., p. 472. 

 Gill-openings separated by a narrow isthmus ; 



mandibuhir barbels branched at the base, 



with a membranous margin at the end ; [p. 474. 



movable m;indibular teeth ('>-9 .... 57. S. mendtranacens, Geoffr., 



1. 8YN0D0NTIS CAUDALIS 



Bouleng. Ann. Mus. Congo, Zool. i. p. 44, pi, xxii. fig. 1 (1899), and Poiss. Bass. 

 Congo, p. 306 (1901). 



Depth of body equal to length of head, 4 to 4 J times in total length. 

 Head as broad as long, nearly smooth above ; snout rounded, h length 

 of head ; eye supero-lateral, o^ to 6 times in length of head ; 2 to 2h 

 times in interorbital width ; lips much developed ; praemaxillary teeth 

 forming a rather long and moderately broad band ; movable mandibular 

 teeth hardly \ diameter of eye, TO to SO in number. Maxillary barbel 

 not margined, IJ to IJ times length of head ; mandibular barbels with 



