197 



SINGLE-OCELLATED CYCHLA. 



Cychla monoculus, Agassiz. 



PLATE XXVI. 

 Cychla monoculus, Agass. Spix, Pise. Bras. tab. Ixiii. 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 ^vith those of the 

 rivers. No information is given respecting it, whether 

 it occasionally or at certain times enters the rivers ; 

 " Habitat in Mari Brasiliccv" 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 the 



