21 4 SILUKID^K. 



7. Synodontis nigritus. 

 Ouv. $ Val. xv. p. 265. pi. 441. 



D. 1/7. A. 14. P. 1/7. V. 7. 

 Mandibulary teeth not elongate. Maxillary barbels as long as 

 the head, not fringed. Nuchal carapace twice as broad as long, with 

 a long process behind, extending nearly along the whole of each 

 side of the base of the dorsal ; humeral process very long, pointed 

 behind. The distance between dorsal and adipose fins is much 

 more than the length of the base of the former. ( Val.) 

 Senegal. 



8. Synodontis humeratus. 

 C'uo. fy Val. xv. p. 264. 



MaxiUary barbels not fringed. Dorsal spine serrated in front. 

 The humeral process is exceedingly long, extending further back- 

 wards than the nuchal cuirass. ( Val.) 



Nile. 



Known from a figure only. 



9. Synodontis gambiensis. 

 D. 1/7. A. 12. P. 1/9. V. 7. 



The gill-opening extends downwards to before the root of the pec- 

 toral fin; Mandibular}" teeth much shorter than the eye, in a narrow 

 band. Maxillary barbels much longer than the head, not fringed ; 

 the outer mandibulary barbels not much shorter than the head, pro- 

 vided with filaments. The height of the body is one-fourth of the 

 total length (without caudal), the length of the head two-ninths. 

 Nuchal carapace tectiform, mujh longer than broad. Dorsal spine 

 rather longer than the head, smooth in front, slightly serrated behind ; 

 pectoral spine serrated along both edges, scarcely longer than that 

 of the dorsal fin ; humeral process longer than high, pointed behind. 

 The distance between dorsal and adipose fins equals the length of 

 the base of the former ; the length of the adipose fin is contained 

 thrice and two-thirds in the total (without caudal). Coloration 

 uniform. 



Gambia. 



a. Eleven inches long : not good state. Presented by the Earl of 

 Derby. 



10. Synodontis zambesensis. 

 Peters, MS. 



B. 7. D. 1/7. A. 13-14. P. 1/8-10. V. 7. 



Maxillary barbels simple. Adipose fin short. " Dentes mandibulae 

 flexiles numerosi (40) ; dentes niandibulae velutini distincti." Dorsal 

 spine smooth in front ; ventral fins a little more distant from the 

 pectorals than from the anal. Skin of the body smooth. Coloration 

 uniform. (Pet.) 



Zambesi. 



