328 SILUEID^. 



rounded ; eye 4 (young) to 5j times in length of head, If to 2f times 

 in interocular width ; mouth inferior, its width If to 2 times in length 

 of head ; praemaxillary band of teeth straight, 2-| to 3 times as long as 

 broad ; vomero-pterygoid teeth forming a narrow band narrowly inter- 

 rupted in the middle; nasal barbel f to ^ diameter of eye; maxillary 

 barbel § length of head ; mandibular barbels shorter, outer If to 1§ 

 times inner. Gill-rakers short, 10-12 on lower part of anterior arch. 

 Dorsal I 6, 1^ to lj times as distant from root of caudal as from end of 

 snout ; spine strong, feebly serrated behind, about | length of head ; 

 first soft ray longest, not produced, shorter than head ; adipose fin 

 longer than base of rayed dorsal, as long as or slightly shorter than 

 its distance from the latter. Anal 12, 7 rays branched. Pectoral 



Fig. 256. 



Clirysichtliys rueppelli. 

 Type (F. N.,). §. 



much shorter than head, spine strongly serrated on inner side. Caudal 

 with rounded or obtusely pointed lobes, longest rays about twice 

 length of median. Caudal peduncle If to 1^ times as long as deep. 

 Pale brown above, white beneath ; an ill-defined dark transverse band 

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



Total length 225 millim. 



Lower Nile. 



1. Type. Lower Nile. Dr. Riippell (0.). 



2-3. Types. Near Ghet-el-Nassara, L. Menzaleh, in L. Loat, Esq. (C). 



fresh water. 

 4. Skel. Lower Nile. 



