XIV 



CONTENTS. 



Phractocephalus 



Phractocephalus hemUopterus 

 Alius .... 



Marbled Arius. 



Arius oncina. Plate IV. 

 Arius obesus 

 Pimelodus .... 

 Pimelodus macidatus 

 Tiger Pimelodus. 



Pimelodus arekaima. Plate V. . 

 Black-spotted Green Pimelodus. 

 Pimelodus insianis. Plate TI. 

 Stripe-tailed Pimelodus. 



Pimelodus notatus. Plate VII. . 

 Pimelodus pirinampu 

 Platystoma .... 

 Striped Platystoma. 



Platystoma tigrinum. Plate VIII 

 The Flat-headed Platystoma. 

 Plattistoma plan ice ps 

 Hypothalmus 



Dawalla of the Arawaaks. 



Hypothalmus daicalla. Plate IX 

 The Lau-lau 



Dorsal Spine of Siluridae. Plate X 

 Sudis 



Gigantic Sudis. 



Sudis pigas. Plate XI. . 

 Osteoglossum 



The Arowana of Guiana. 



Osteoglossum arowana. Plate XII. 

 Chalceus .... 

 ChalcetLS rotundatus 

 Blue-banded Chalceus. 



Chalceus fieniatus 

 Thick-lipped Chalceus. 



Chalceus lahrosus. Plate XIII. Fig. 1. 



