566 EXPLANATION OF THE PLATES. 



PLATE XX. 



Alestes macrolepidotus, C. & V., p. 127. f nat. size. Upper specimen from 

 Gondokoro, lower from Rosaires. 



PLATE XXI. 



Fig. 1. Ichthyoborus besse, Joann., p. 134. Fashoda. Nat. size. a. Upper view of 



head, nat. size; b. Open mouth, X 2. 

 Fig. 2. Ichthyoborus besse, Joann. Mouth of Lake No. Nat. size. 

 Fig. 3. Nannwthiops unitamiatus, Gthr., p. 137. Gaboon. (Type.) Nat. size. 

 Fig. 4. Nannoeharax niloticus, Joann., p. 150. Kaka, White Nile. X 2. 



PLATE XXII. 



Distichodus niloticus, L., p. 141. Adult, Beni Souef, with upper view of head, 

 f nat. size, and young, Fashoda, nat. size. 



PLATE XXIII. 



Fig. 1. Distichodus niloticus, L., p. 141. Skeleton, Nile. Nat. size. la. Upper 



view of skull. 

 Fig. 2. Distichodus rostratus, Gthr., p. 143. Lower Nile. (Type.) f nat. size. 



2 a. Upper view of head. 



PLATE XXIV. 



Fig. 1. Distichodus brempmnis, Gthr., p. 146. Fashoda. Nat. size. 1 a. Upper 



view of head. 

 Fig. 2. Distichodus engycephalus, Gthr., p. 148. Khartum. (Type.) Nat. size. 



2 a. Upper view of head. X If. 



PLATE XXV. 



Citharinus citharus^ Geoffr., p. 153. Biba. ^ nat. size. 



PLATE XXVI. 



Citharinus latus, M. & T., p. 156. Gondokoro. f nat. size. 



