LIST OF PLATES. 



Frontispiece: The Kaieteur Falls (Facing p. 1) 



Plate. 



I. Aspredo sicuephorus Cuvier and Valenciennes; Bunocephalus gronovii 

 Bleeker. 

 II. Bunocephalus chamaizelus Eigenmann; Bunocephalus amaurus Eigenmann. 

 (Type.) 



III. Agmus lyriformis Eigenmann. (Type.) 



IV. Agmus scabriceps Eigenmann and Eigenmann. (Type.) 



V. Sciadeichthys flavescens (Cuvier and Valenciennes) ; Sciadeichthys proops 

 (Cuvier and Valenciennes) ; Sciadeichthys parkeri (Traill) . 

 VI. Sciadeichthys proops (Cuvier and Valenciennes) ; Dorsal view (the so-called 



"monk"); Palatal view (the so-called "crucifix"); Lateral view. 

 VII. Selenaspis herzbergi (Bloch) ; Selenaspis passany (Cuvier and Valenciennes). 

 VIII. Nolarius grandicassis (Cuvier and Valenciennes) ; Nolarius parmocassis 

 (Cuvier and Valenciennes); Nolarius stricticassis (Cuvier and Valen- 

 ciennes.) 

 IX. Sciadeichthys emphysetus (Miiller and Troschel); Arius spixi (Agassiz); 

 Hexanematichthys rugispinis (Cuvier and Valenciennes). 

 X. Pseudopimelodus villosus Eigenmann. (Type); Megalonema platycephalum 

 Eigenmann. (Type.) 

 XI. Pseudopimelodus albomarginatus Eigenmann. (Type); Brachyglanis melas 



Eigenmann. (Type.) 

 XII. Brachyglanis phalacra Eigenmann. (Type); Microglanis pwcilus Eigen- 

 , mann. (Type.) 



XIII. Brachyglanis phalacra Eigenmann. (Type) ;Leptoglan is essequibensis Eigen- 



mann. (Type.) 



XIV. Myoglanis potaroensis Eigenmann. (Type); Chasmocranus longior Eigen- 



mann. (Type.) 

 XV. Chasmocranus brevior Eigenmann. (Type) ; Pimelodella megalops Eigen- 

 mann. (Type.) 

 XVI. Pimelodella maciurki Eigenmann. (Type) ; Pimelodus heteropleurus Eigen- 

 mann. (Type.) 

 XVII. Leptodoras linnelli Eigenmann. (Type); Trachycorystes obscurus (Gunther). 

 (Type) ; Brachyplaty stoma vaillanti (Cuvier and Valenciennes) ; Doras 

 granulosus Valenciennes. 



