174 Messrs. E. Lonnberg and H. Rendahl on 



total number amounts to about 25. Maxillary barbel mar- 

 gined and somewhat crenulated, ^ the length of the head. 

 Mandibular barbels branched, the outer § length of head, the 

 inner i. Gill-opening not extending beyond the root of the 



Fig. 4. 





Synodontis ovidius, a little more than 5 nat. size. 

 Fig. 5. 



Lower side of head of Synodontis ovidius, nat. size. 



pectoral. Occipital nuchal shield rugose and granular, 

 longer than broad, with rather pointed posterior processes. 

 Humeral process coarsely granular, about twice as long as 

 broad, bluntly pointed, but with convex upper and lower 



