238 



Mr. C. T. Reoan on the South- American 



The probable relationships of the genera may be expressed 

 diagraramatically thus : — 



Keetroplut. 



Fsraneetroplui. 



Herotilapia. 



\ 



Heriohthys. 



(C. ntbuliferum.) 



Petenia. 



/ 



SymphyiodoD 



(C. multispiitoauDi.) (C. labriilens.) 



I 



(C. Dovii.) 



Pterophyllum 



Heterogramma. 



