208 CIIALCEUS. 



best to place Erythrinus at the end of the Salmon, 

 as allied to them in dentition and habits, and as 

 passing to the other by external form and the 

 want of the adipose fin ; while Prochilodus is re- 

 moved to the Carps, some of them appearing to be 

 so in every essential, the presence of the adipose fin 

 excepted. Passing from the True Herrings then, 

 the genera which appear to represent them among 

 the Salmon are Coregonus^ Anodus, Chalceus, &:c. 

 In the warm regions of South America, we are not 

 aware that any examples of the typical Salmon 

 have been discovered; none occur in the present 

 collection, and the place of Coregonus seems sup- 

 plied by Anodus and Ohalceus, which are tolerably 

 abundant in many of the rivers and lakes in Gui- 

 ana. We shall first take the genus 



CHALCEUS. 



In the outward form of several of the spe- 

 cies we are reminded of the Herrings, a resem- 

 blance still more increased by the large scaling, 

 the posterior position in which the dorsal fin is 

 often placed, and in the elongated form of the anal 

 tin. These will be seen in the outline figures given 

 with our first description. In structure, it will be 

 observed from our notes that they are equally re- 

 markable by an alliance to the Carps in a double 

 air-bladder, while their habit of feeding on vege- 

 tables brings them still nearer. The generic charac- 

 ters, as given in the Brazilian Fishes, are, — 



