56 



MOBMYRUXE. 



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



Total length (without caudal fin) 



195 



170 



152 



Greatest depth 



47 



43 



39 



Length of head (without mental appendage) 



44 



40 



36 



Width of head 



20 

 16 



18 

 15 



17 

 14 



Length of mental appendage 



Length of snout 



15 



14 



12 



Diameter of eye 



6 



6 



5 



Interocular width 



13 

 5 



11 

 4 



10 



4 



Width of mouth 



Length of caudal peduncle 



31 



26 



25 



Depth of caudal peduncle 



13 



12 



11 





29 



28 



26 



Number of rays in dorsal fin 



23 



24 



23 



,, anal fin 



30 

 60 

 13 



30 

 58 

 13 



31 

 64 

 13 



scales in lateral line . 





., „ ,, lateral line to the middle of the belly 



19 



17 



17 



,. ,, between dorsal fin and lateral line 



10 



10 



11 



,, „ ,, lateral line and anal fin 



9 



9 



10 



round caudal peduncle 



10 



10 



12 





Uniform blackish brown, lower side of head sometimes whitish ; iris white. 



The type specimen measures 265 millimetres. 



This species inhabits Lake Victoria. The very short description given by the 

 late Prof. Hilgendorf has been supplemented by a sketch executed for me by 

 Fraulein Hedwig Plate under his supervision ; this sketch is here reproduced. This 

 unique specimen was obtained by the late Dr. G. A. Fischer. The above description 

 is taken from ten specimens obtained at Buganga by Mr. E. Degen, on Nov. 15, 

 1905. 



I have little doubt the fish mentioned by Gunther in 1869 under the name of 

 Mormyrus petersii as having been obtained by Speke on the White Nile at Urundogani, 



