PETROCEPIIALUS. 



55 



less than its distance from caudal. Anal 30-35, equally distant from 

 base of ventral and from base of caudal, or a little nearer latter. 

 Pectoral pointed, f to f length of head, nearly twice as long as ventral, 

 and extending beyond base of latter. Caudal scaled at the base, with 

 pointed lobes. Caud;il peduncle 2| to barely o times as long as deep, 

 f to f length of head. 38-43 scales in lateral line, ^^^r-, in transverse 

 series on body, y^y^ i^^ transverse series between dorsal and anal, 10 or 

 12 round caudal peduncle. Uniform silvery, the hack a little darker, 

 the fins white. 



Total length 120 millim. 



Lower Nile, Senegal, Gambia. — Type in Paris INluseum. 



1. Ad. Kafr-el-Zayat, Rosetta Nile. L. Loat, Esq. (V.). 



2-11. Ad. & hgr. Kaedi, Senegal. M. P. Delhez (C). 



12. Ad. McCarthy Id., Gambia. J. S. Budgett, E^<[. (P.). 



7. PETROC^EPHALUS KEATINGII. 

 Bouleng. Ann. & Mag. N. H. (7) viii. 1901, p. 411, and Fish. Nile, p. 38, pi. viii. 

 fig. 2 (1907). 

 Depth of body 2f to 3 times in total length, length of head 4 to 4^ 

 times. Head as long as deep ; snout very short, J or | length of head, 

 rounded, projecting beyond mouth ; mouth below eye, its width f length 

 of head; teeth bicuspid, 16 in upper jaw, 26 in lower; nostrils on 



Fijr. 40. 



Petrocephiiliis IcenU n(jil. 

 Type (F. N.). 



a level with lower border of eye ; eye large, longer than snout, its 

 diameter J length of head, equal to interocular width. Dorsal 25, 

 originating above 15th ray of anal, its length twice in its distance from 

 head. Anal 38-39, equally distant from base of ventral and from base 



