"S'38 siltjkim:. 



C. rueppellii is very closely related to the preceding species, but may be 

 distinguished from it by the generally smaller eye, especially as compared to the 

 interocular width (its diameter once and three-fourths, in the young, to twice and 

 one-third, in the adult, in the interocular width), the usually longer adipose dorsal fin 

 (its base equal to or very slightly less than its distance from the rayed dorsal), and by 

 the shorter and rounded or very obtusely pointed lobes of the caudal fin (the longest 

 rays twice to twice and a half the length of the median). The first soft ray of the 

 dorsal fin is not produced, and the upper surface of the head is smooth, covered with 

 a thick skin. The band of prsemaxillary teeth is twice and a half to three times as 

 long as broad, and the vomero-pterygoid teeth form a rather narrow but long band, 

 which is narrowly interrupted in the middle. 6 branched dorsal and 7 branched 

 anal rays. 



The coloration is the same as in C. auratus. 



Total length 225 millimetres. 



I have examined only four specimens of this fish, the measurements of which are 

 here given. The largest is from the Lower Nile, from Ruppell's Collection, the three 

 others were obtained by Mr. Loat in a freshwater pool near Ghet-el-Nassara, Lake 

 Menzaleh, on June 11th, 1899. 



