726 DR. A. Gl'NTHEi!, OK FISHES [June 6, 



length of the head, broad, with the upper profile descending in a 

 gentle curve. Mouth wide, wider than the distance between the 

 eyes, with the upper jaw overlapping the lower. JS'asal barbels 

 minute ; maxillary barbels extending to the margin of the praj- 

 operculum ; outer mandibulary barbels not reaching the gill-opening; 

 inner mandibulary barbels anterior to the outer, and less than 

 half a diameter of the eye distant from each other. The vomerine 



Fig. 6. 



Chrysichthys lagoensis. 



teeth are disposed in a narrow band on each side, tapering behind, 

 the two bands being separated in front by a toothless space, less 

 than half a diameter in width ; however, on the right side there are 

 vestiges of another narrow tooth-band, stretching across the 

 junction of the vomer with the palatine.^ Each half of the inter- 

 maxillary band rounded at its lateral extremity, half as long as 

 broad. The width of the bony interorbital space is more than the 

 diameter of the eye, which is two fifths of the length of the snout 

 and one fifth of that of the head. Dorsal fin elevated and enlarged, 

 reaching the adipose when laid backward ; the length of its 

 base is one half of its distance from the adipose fin, and double 

 the length of the base of the latter. Dorsal spine rather longer 

 than the head without snout, and longer than the pectoral spine ; 

 it is slightly roughened in front, and feebly denticulated behind. 

 Anal fin reaching the caudal, when laid backward, with 11 rays, 

 7 of which are branched, the last split to the base. Cleft of the 

 caudal of moderate depth, the upper lobe as long as the head. 

 Upper and lateral parts brownish, lower white. 



Lagos (Nat. Hist. Mus. 66.3.8.16). Length 377 millim. 



A form intermediate between Ch. nigrodigitatus and Ch. macrops. 



A number of very young specimens, collected by Mr. "Walker on 

 the Eiver OfBm, belong to a species most closely allied to Ch. lago- 

 ensis, but it would be hazardous to refer them to that species 



^ Of course, this condition cannot be regarded as a specific character, but I 

 describe it as I find it in the only specimen available. 



