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STRONG-TOOTHED HYDROCYON. 

 Hydrocyonl armatus. 



PLATE XXV. 



Macusi, Patlia ; Warrau, Baiarra ; L. Geral, Pirantera. 

 Schomb. Drawings, No. 8. 



This remarkable and strongly armed fish should 

 evidently have its station near to the last, but its 

 true generic place is less easily determined from the 

 drawing only. The structure of the teeth, as stated 

 in Mr. Schomburgk's notes, requires attention ; and 

 the base of the anal fin is represented as being 

 covered with scales for a breadth more than equal 

 to the whole membranous part. It has some alli- 

 ance also to CyTwdon of Spix, one of Cuvier's types, 

 where the anal fin is similarly scaled at the base. 



" This fish is found in all the rivers of Guiana, 

 and is known from all others by the length of the 

 canine teeth, which are so long in the lower jaw as 

 to protrude through the upper, into sockets prepared 

 for their reception. It weighs ten or twelve pounds. 

 The body silvery bluish green on the back; the 

 head of the same colour. Dorsal fin is greenish, 

 webbed with blue and tipped with red; pectoral 



