1 . ExnopLus. 265 



d. Teeth conical, forming a narrow band ; body ovate, more or less elevated, 

 covered witli ctenoid scales ; anterior prominences of the outer branchial 

 arch short. 



Anal spines 3-4; the soft dorsal naked 

 or shghtly scaly at the base ; jaw^a equal 

 anteriorly or the lower prominent 5. Acara, p. 276. 



Anal spines 3-4 ; the soft dorsal naked ; 



the upper jaw overlapping the lower. . . 6. Thkraps, p. 284. 



Anal spines 5 or more ; cleft of the mouth 

 rather narrow ; scales of moderate size ; 

 the origin of the ventral falls vertically 

 behind that of the dorsal 7. Heros, p. 28.'). 



Anal spines 8-9 ; scales of moderate size ; 

 the origin of the ventral falls vertically 

 before that of the dorsal 8. Mesonauta, p. 300. 



Anal spines 5 ; cleft of the mouth wide. . . 9. Petenia, p. 301 . 



Anal spines 8 ; scales small 10. Uaru, p. 302. 



Anal spines 3 ; dorsal fin enveloped in 



small scales 11. Hygrogonus, p. 303. 



e. Teeth villiform, in a broad band ; habit Perch-like ; anterior prominences 

 of the outer branchial arch lanceolate, crenulated, \Wdely set. 



Anal spines 3 ; vertical fins scaly 12. CiciilAj p. 303. 



/. Teeth villiform or conical ; body depressed, elongate, subeylindrical ; 

 anterior prominences of the outer branchial arch short. 



Anal spines 3 ; vertical fins scaleless 13. Creniciciila, p. 305. 



II. The anterior prominences of the outer branchial arch are long, setiform, 



closely set. 



Anal spines 3 14. Chj:tobranchus, p. 309. 



III. The outer branchial arch is provided with a compressed lamelliform lobe 

 at its upper extremity. 



Eye in, or in advance of, the middle of the 



length of the head 15. Mesops, p. 311. 



Eye behind the middle of the length of 



the head ; dorsal fin scaleless 16. Satanoperca p. 312. 



Eye behind the middle of the length of 

 the head ; base of the soft dorsal scaly. 17. Geopiiagus, p. 315. 



B. The soft portion -of the dorsal fin is more developed than the spinous. 



I. Branchial arches with the anterior prominences very obsolete. 



Anal spines 8-10 18. Symphysodon, p. 315. 



II. Anterior prominences of the outer branchial arch setiform. 



Anal spines G •. 10. Pterophyllum, p. 316. 



1. ETROPLUS. 



Etroplus, Cuv. ^ Val. v. p. 486. 

 Etroplus et Pseudetroplus, BIceker. 



Body compressed, elevated, covered v»ith ctenoid scales of moderate 

 Rize. Dorsal and anal spines nunierons. Teeth compressed, lobate, 



