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. Notarius grandicassis (Cuvier and Valenciennes); Notarius parmocassis 

 (Cuvier and Valenciennes); Notarius 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.) 

 XL Pseudopimelodus albomarginatus Eigenmann. (Type); Brachijglanis melas 



Eigenmann. (Type.) 

 XII. Brachyglanis phalacra Eigenmann. (Type); Microglaiiis poecilus Eigen- 

 mann. (Type.) 



XIII. Brachijglanis phalacra Eigenmann. (Type) ; Leptoglanis 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 macturki Eigenmann. (Type) ; Pimelodus heteropleurus Eigen- 

 mann. (Type.) 

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

 (Type); Br achy platy stoma vaillanti (Cuvier and Valenciennes); Doras 

 granulosus Valenciennes. 



Xlll 



