197 



SINGLE-OCELLATED CYCHLAr 



Cychla monoculus, AGASSIZ. 



PLATE XXVI. 



Cychla monoculus, Agass. Spix, Pise. Bras. tab. lxi& p. 100. 



AND we have been induced to give a figure of it as 

 a marine species, if it should eventually be found 

 to continue generically associated with those of the 

 rivers. No information is given respecting it, whether 

 it occasionally or at certain times enters the rivers ; 

 u Habitat in Mari Brasilicce" is all our informa- 

 tion. The form appears to agree ; the ground 

 colour, above olive shading into reddish yellow, 

 is marked with the usual bands, and there is a 

 single occellated spot on the base of the tail, car- 

 rying through also that kind of spotting. Formula 

 of the fins, 



D. 15/16 P. 15 V. 6 A. 3/11 C. 5/13/5. 



In the second volume of Humboldt's Zoological 

 Researches, three species of Cychla are described, 

 from the Oronoco, which seem all distinct from th<; 



