APPENDIX C. 
243 
Alestes nurse, Riipp. 
D. 10. A. 16. L. lat. 29. L. transv. 
The height of the body is one-third^ or somewhat less than one- 
third, of the total length (without caudal), the length of the head 
a little more than one-fourth. The origin of the dorsal fin is only 
a little behind that of the ventral ; the pectoral terminates at some 
distance from the ventral. Bright silvery, with a very indistinct 
blackish spot above the lateral line, behind the gill-opening ; some- 
times another large blackish blotch at the base of the caudal fin. 
Iris light yellow. 
Alestes ruppellii, Gthr. 
D. 10. A. 17. L. lat. 30. L. transv. -||. 
The height of the body is one-third, or a little less than one- 
third, of the total length (without caudal), the length of the head 
one-fourth, or, in younger examples, somewhat more than one- 
fourth. The origin of the dorsal fin is a little behind that of the 
ventral, midway between the extremity of the snout and the root 
of the caudal. The pectoral terminates close to the ventral. Bright 
silvery, with a very indistinct blackish humeral spot ; caudal spot 
absent or very indistinct. Iris golden, with a broad black ring ; 
sometimes entirely black in specimens preserved in spirits. 
Upper Nile. 
16—2 
