MAROUSENIUS. 



43 



Measurements (in millimetres) and numbers of fin-rays and scales. 



Total length (without caudal fin) 



Greatest depth of body 



Length of head . . 



Width of head 



Length of snout 



Diameter of eye 



Interocular width 



Width of mouth 



Length of caudal peduncle 



Depth of caudal peduncle 



Length of pectoral fin 



Number of rays in dorsal fin 



„ anal fin 



scales in lateral line , 



,, from the middle of the back to the lateral line 

 „ ,, lateral line to the middle of the belly 



„ between dorsal fin and lateral line 



,, „ lateral line and anal fin 



„ round caudal peduncle 



90 



31 



21 



11 



4 



4 



7 



4 



20 



7 



20 



19 



24 



56 



11 



17 



13 



11 



18 



17 I 15 



50 



17 



13 



7 



3 



3 



5 



3 



11 



4 



11 



21 



24 



53 



11 



15 



13 



10 



16 



1. Eosetta branch of Nile. — Loat. 



2. Lower Nile. — Riippell. 



3. Between Luxor and Assuan. — Loat. 



4. Assuan. — Loat. 

 5-7. Luxor. — Loat. 



Having counted the dorsal and anal fin-rays in fifty specimens 1 find two specimens 

 with 18 dorsal rays, twelve with 19, twenty with 20, fifteen with 21, one with 22 ; 

 two specimens with 22 anal rays, four with 23, twenty-one with 24, twenty with 25, 

 and three with 26. 



This species occurs throughout the Nile from Gondokoro to the Delta. It has not 

 been found in the Blue Nile. 



g2 



