EXPLANATION OF THE PLATES. 



PLATE I. 



Pplypterus btchir, Geoffr., p. 5. Mansurab, Lower Nile. With upper and lower 

 views of head and anterior part of body, -f nat. size. 



PLATE II. 



Pohjpterus endlicheri, Heck., p. 9. Goz-abu-Gumah, White Nile. With upper and 

 lower views of head and anterior part of body, and skeleton, § nat. size. 



PLATE III. 



Polypterus senegalus, Cuv., p. 11. Khartum. "With upper and lower views of head 

 and anterior part of body, and skeleton. Nat. size. 



PLATE IV. 



Protopterus wthiopicus, Heck., p. 19. Lake Albert Edward, f nat. size. Adult and 

 skeleton. 



PLATE V. 



Fig. 1. Mormyrops anguilloides, L., p. 29. Sanhur. Nat. size. 

 Fig. 2. Hyperopisus bebe, Lacep., p. 70. Near Cairo, f nat. size. 



PLATE VI. 



Fig. 1. Petrocephalus bane, Lacep., p. 30. Near Cairo. Nat. size. 

 Fig. 2. Gnathonemus cyprinoides, L , p. 50. Lahun, Fayum. Nat. size. 



