SYJTODONTIS. 



381 



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 8 (young) to 21 strong serrse. 

 Ventral fin acutely pointed, reaching the origin of the anal fin, or not quite so far. 

 Caudal fin deeply forked. Caudal peduncle as long as deep or a little deeper 

 than long. 



Body and adipose dorsal fin silvery grey to dark purplish ; lower parts dark brown 

 to black ; barbels blackish ; fins grey, ventrals, anal, and caudal with round black spots ; 

 iris brown. Young with large dark spots, separated by a network of the light ground- 

 colour, the spots on the fins larger and confluent into cross- bands. 



Total length 240 millimetres. 



Measurements (in millimetres). 



Total length (without caudal) 



Greatest depth 



Length of head 



Width of head 



Length of snout 



Diameter of eye 



Interorbital width 



Width of mouth 



Maxillary barbel 



Outer mandibular barbel .... 

 Inner mandibular barbel .... 



Length of dorsal spine 



Basal length of dorsal fin ... . 



,, „ adipose fin . . 



Greatest depth of adipose fin 



Length of pectoral spine .... 



210 

 77 

 67 

 41 

 27 

 13 

 20 

 21 

 65 

 39 

 21 

 63 

 37 

 80 

 22 

 59 



195 

 65 

 58 

 44 

 24 

 11 

 18 

 19 

 48 

 34 

 19 

 55 

 32 

 68 

 20 

 54 



4. 



175 

 67 

 58 

 39 

 23 

 11 

 15 

 16 

 49 

 32 

 18 

 57 

 31 

 64 

 20 

 51 



150 

 57 

 46 

 33 

 20 

 10 

 14 

 15 

 37 

 27 

 17 

 44 

 25 

 58 

 20 

 45 



5. 



6. 



125 



110 



43 



38 



38 



35 



25 



22 



16 



14 



8 



8 



10 



8 



10 



9 



35 



38 



20 



24 



9 



15 



39 



31 



21 



21 



47 



35 



15 



12 



38 



32 



90 

 32 

 34 

 21 

 13 

 7 

 7 

 9 

 28 

 18 

 12 

 32 

 16 

 31 

 12 

 27 



76 



25 



28 



16 



12 



7 



6 



8 



20 



16 



14 



26 



7 



22 



43 



14 



14 

 9 

 5 

 4 

 4 

 5 



12 

 8 

 6 



15 

 7 



16 

 4 



3 



1. Shari E. — Gosling. 



2. Gondokoro. — Loat. 



3. 4. Lake No. — Loat. 



5. Kaedi, Senegal. — Delhez. 



6. Gambia. — Budget t. 



7, 8. Fashoda. — Loat. 

 9. Khartum. — Flower. 



