458 SILURID.^. 



as far back as occipito-nuchal process or not quite so far. Uorsal I 7 ; 

 spine curved, feebly serrated behind, distinctly but finely serrated in 

 front, as long as or a little shorter than head, the soft terminal part 

 usually produced into a short filament. Adipose dorsal 3 to 4 times as 

 long as deep, 5 to 8 times as long as its distance from rayed dorsal. 

 Anal V 7-8, obtusely pointed in front. Pectoral spine nearly as long 

 as or a little longer than dorsal, reaching or nearly reaching root of 

 ventral, outer border finely, inner more strongly serrated. Ventral not 

 reaching anal. Caudal deeply forked, upper lobe the longer and some- 

 times prolonged into a filament. Caudal peduncle as long as deep or 

 deeper than long. Uniform grey or brownish above, white beneath ; 

 young with minute dark specks on the back and on the adipose fin. 



Total length 470 millim. 



Nile. — Type in Senckenberg Museum, Frankfort (M.). 



1-2. Ad. Near SumannuJ, Damietta L. Loat, Esq. (C). 



Nile. 



3. Hgr. Beni Souef, [>ower Nile. ,, 



4-8. Ad. & ligi-. Assuan. ,, 



D-10. Ad. & ligr. Abu Hor, Upper Nile. 



11. Hgr. Mirrvvau, „ „ 



12. Ad. El Maharraka, „ 



13-15. Ad. & Ii^r. Ibrim, „ „ 



IG. Hgr. Abaad, ,, „ 



17-18. Ad. & ligr. Fergunt, ,, ,, 



VJ-20. Ad. Abu Simbal, 



21. Skel. „ 



22. Hgr. Wady Haifa, „ 

 23-24. Hgr. Koslieb, 



25, 2G, 27. Ad. *t Khartum. J. Petherick, Esq. (;(!.). 



yg- 



28. Ad. Ahmed Aga, White Nile. L. Loat, Esq. (C). 



21). Hgr. Between Khartum and the Mr. P. C. Zaphiro (C.) ; 



Sobat. ^V. N. McMillan, Esq. (P.). 



40. SYNODONTIS GELEDENSIS. 

 CJiiiuh. Pioc. Zool. Soe. 1890, p. 220, fio-. 

 't' Si/jiodoidi.f serrafus, Vincig. Ann. Mus. Genova, (2) xvii. 180(», p. 351. 



Depth of body 3^ times in total length, length of head of times. 

 IJead IJ times as long as broad, rugose above from between the eyes; 

 snout pointed, a little longer than postocular part of head ; eye supero- 

 lateral, 8 times in length of head, 2| times in interorbital width ; lips 

 moderately developed ; praemaxillary teeth forming a short and broad 



