384 



SILUKIDiE. 



acutely pointed, with 13 or 14 rays, 8 or 9 of which are branched. Pectoral spine 

 usually as long as or a little longer than that of the dorsal, not reaching the base of the 

 ventral fin, its outer border feebly serrated, its inner border with 7 (young) to 32 strong 

 serrse. Ventral fin acutely pointed, reaching the origin of the anal fin or a little 

 beyond. Caudal fin deeply forked. Caudal peduncle deeper than long. 



Silvery grey or whitish, the lower parts dark brown to black ; barbels whitish, with 

 the membranous border dark brown or black; iris white. Young with ill-defined 

 dark blotches on the body, and with round dark spots on the rayed fins, forming more 

 or less regular transverse series. 



Total length 455 millimetres. 



Measurements (in millimetres). 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 



10. 



390 



325 



300 



280 



170 



115 



95 



75 



50 



126 



118 



112 



111 



56 



40 



37 



23 



15 



127 



112 



103 



93 



61 



43 



38 



31 



20 



85 



73 



66 



59 



34 



25 



21 



16 



10 



57 



50 



48 



40 



28 



19 



17 



14 



8 



20 



18 



18 



15 



11 



8 



7 



7 



5 



35 



34 



28 



28 



15 



10 



8 



7 



5 



42 



39 



39 



31 



21 



14 



12 



9 



6 



100 



91 



115 



86 



67 



37 



30 



30 



20 



58 



60 



69 



53 



35 



22 



19 



16 



9 



33 



22 



36 



31 



19 



11 



12 



10 



6 



88 



79 



70 



72 



9 



35 



? 



22 



14 



51 



47 



46 



40 



24 



17 



15 



11 



7 



149 



112 



108 



163 



62 



44 



31 



27 



17 



40 



28 



34 



33 



19 



13 



8 



7 



5 



95 



82 



83 



67 



? 



31 



24 



22 



12 



Total length (without caudal) 410 



Greatest depth 155 



Length of head 145 



Width of head 97 



Length of snout 65 



Diameter of eye 22 



Interorbital width 40 



Width of mouth 48 



Maxillary barbel 120 



Outer mandibular barbel ! 67 



Inner mandibular barbel 38 



Length of dorsal spine 90 



Basal length of dorsal fin 



„ ,, adipose fin 155 



Greatest depth of adipose fin 44 



Length of pectoral spine 1106 



1, 2, 7. Khartum. — Petherick. 



3, 4. Lake No.— Loat. 



5. Lokoja, Niger. — Budgett. 



6. St. Louis, Senegal. — Delhez. 

 8. Lake Chad. — Gosling. 



9. Niger Delta. — Crosse. 

 10. Assay, Niger. — Ansorge. 



