SYNODONTIS. 



453 



4 times in total length. Head as long as broad, finely granulate above ; 

 snout rounded, f or a little less than £ length of head; eye supero- 

 lateral, 3-§ to 41 times in length of head, \\ to 2 times in interorbital 

 width ; lips moderately developed ; pmemaxillary teeth forming a short, 

 broad band ; movable mandibular teeth hardly f diameter of eye, 40 to 

 65 in number. Maxillary barbel not margined, at least twice as long- 

 as head, reaching or nearly reaching base of ventral ; mandibular barbels 

 with long, slender branches, outer twice as long as inner and longer than 



Synodontis grestioffi. 

 Type. 



head. Gill-opening not extending downwards beyond root of pectoral 

 spine. Occipito-nuchal shield finely granulate, tectiform, longer than 

 broad, with obtuse or rounded posterior processes. Humeral process at 

 least twice as long as deep, striated and keeled, acutely pointed, extend- 

 ing as far hack as, or a little beyond, occipito-nuchal process. Skin 

 villose on the sides. Dorsal I 6-7 ; spine scarcely curved, as long as 

 head, smooth in front, feebly serrated behind. Adipose dorsal 3J to 

 4 times as long as deep, 2 to 3 times as long as its distance from rayed 

 dorsal. Anal III 8-10. Pectoral spine at least as long as head, 

 strongly serrated on both sides. Ventral reaching or not anal. Caudal 



