EXPLANATION OF THE PLATES. 



PLATE XCIV. 



Tilapia nilotica, L., p. 523. Skeleton. Nile, -§ nat. size. a. Upper view of cranium ; 

 I. Upper pharyngeal bones ; c, d. Lower pharyngeal bones, upper and lower 



PLATE XCV. 

 Tilapia galilcea^, Art., p. 531. Khartum. Nat. size. 



PLATE XCVI. 



Petrochromis andersonii, Blgr., p. 535. Lake Albert. (Type.) Nat. size. 



PLATE XCVIL 



Tetrodon fahaka, L., p. 544. Khartum. Nat. size. With front view of head. 



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