CONTENTS. 



Phractoceplialus 



Phractocephalus hemilopterus 

 Arius 



Marbled Arius. 



Arius oncina. Plate IV. 

 Arius obesus 

 Pimelodus 



Pimelodus maculatus , 

 Tiger Pimelodus. 



Pimelodus arekaima. Plate V. 

 Black-spotted Green Pimelodus. 

 Pimelodus insignis. Plate VI. 

 Stripe-tailed Pimelodus. 



Pimelodus notatus. Plate VII. 

 Pimelodus pirinampu 

 Platystoma . 



Striped Platystoma. 



Platystoma tigrinum. Plate VIII. 

 The Flat-headed Platystoma. 

 Platystoma planiceps 

 Hypothalmus 



Dawalla of the Arawaaks. 



Hypothalmus dawalla. Plate IX. 

 The Lau-lau 



Dorsal Spine of Siluridse. Plate X. 

 Sudis 



Gigantic Sudis. 



Sudis gigas. Plate XI. . 

 Osteoglossum 



The Arowana of Guiana. 



Osteoglossum arowana. Plate XII. 

 Chalceus 



Chalceus rotundatus 

 Blue-banded Chalceus. 



Chalceus tmiiatus 

 Thick-lipped Chalceus. 



Chalceus lahrosus. Plate XIII. Fig. I. 



