CHEYSICHTHYS. 



o.)S 



interneural shield; snout obtusely pointed, not much broader than long; 

 eye large, transversely oval, its diameter 1 (young) to 2-^- times in length 

 of snout, 3 to 6 times in length of head, not more than ]f times in 

 interorbital width ; mouth inferior, its width 2\ to 4 times in length of 

 head ; prsemaxillary band of teeth straight, \ to o\ times as long as 

 broad ; vomero-pterygoid teeth forming a narrow band interrupted in 

 the middle, sometimes reduced to the vomerine part; nasal barbel \ to 

 \ diameter of eye; maxillary barbel \ to f length of head; outer 

 mandibular barbel a little longer than inner, f to f the length of the 

 maxillary barbel. Gill-rakers rather long, 12-17 on lower part of 

 anterior arch. Dorsal I 6, 1\ to 1-j times as distant from root of caudal 

 as from end of snout ; spine \ to f length of head, smooth or granulate 

 in front, rather feebly serrated behind ; second soft ray longest, •§ to 

 1-g- times length of head. Base of adipose fin shorter than that of 

 dorsal, from which it is separated by a space equal to 2 to 4 times 

 its base. Anal 12-14, 8 or 9 (rarely 7) rays branched. Pectoral f to 

 j length of head ; spine smooth or feebly granulate on outer border, 

 strongly serrated on inner. Caudal deeply forked, upper lobe longest 

 and often produced into a filament, at least 3 times as long as middle 

 rays. Caudal peduncle 1^ to If times as long as deep. Dark grey or 

 brown above, silvery white beneath ; a more or less indistinct dark 

 transverse band behind the head and another in front of the dorsal fin. 



Total length 370 millim. 



West Africa, from the Senegal to the Ogowe. — Type in Paris 



M. P. Delhez (C.). 



J. S. Budgett, Esq. (P.). 

 R. B. 1ST. Walker, Esq. (P.). 



H. T. Usslier, Esq. (C). 



Mr. J. T. Dalton (C). 

 J. S. Budgett, Esq. (P.). 

 Dr. W. J. Ansorge (C.). 



H. L. Norton Traill, Esq. (0.) . 

 MajorW. A.C. Cockburn(P.). 

 G. L. Bates, Esq. (C). 

 y2 



Museum. 

 1-2. Ad. 



St. Louis, Senegal. 



3. Hgr. 



Kaedi, „ 



4-10. Ad., hgr., & yg. 



Gambia. 



11, 12-15. Ad. &yg. 



R. Prah, Gold Coast. 



16-21. Yg. 



R. Offin, 



25. Hgr. 



Nyankoma, „ 



26. Ad., type of 



Lagos. 



C. lagoensi*. 





27, 28. Ad. & yg. 



Niger. 



29. Ad. 



Lokoja, Upp. Niger. 



30. Yg. 



Assay, Low. Niger. 



31-32. Yg. 



Sapelle, „ 



33. Yg. 



Benue R., North of Ibi. 



34. Hgr. 



Enyong B., Old Calabar. 



35. Ad. 



Kribi R., Cameroon. 



