1 . KTROPLITS. 265 



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

 covered with ctenoid scales ; anterior prominences of the outer branchial 

 arch short. 



Anal spines 3-4 ; the soft dorsal naked 



or slightly scaly at the base ; jaws equal 



antei'iorly or the lower prominent 5. Acara, p. 276. 



Anal spines 3-4 ; the soft dorsal naked ; 



the upper jaw overlapping the lower. . . 6. Theraps, 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. 285. 



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. 



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

 of the outer brancliial arch lanceolate, crenulated, widely set. 

 Anal spines 3; vertical fins scaly 12. Cichla, 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. Cre.nicichla, p. 305. 



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



closely set. 



Anal spines 3 14. Ch.etobranciivs, p. 309. 



III. The outer brancliial 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 1(5. Satanoperca, p. 312. 



Eye behind the middle of the length of 



the head ; base of the soft dorsal scaly. 17. GrEOPHAfif.s, 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 spmes 8-10 18. Symphysodon, p. 315. 



II. Anterior prominences of the outer brancliial arch setiform. 



Anal spines 19. Pterophylmm. p. 316. 



1. ETROPLUS. 



Etroplus, Cue. ^- fill. V. p. -iKij. 

 Ultroplus et P.«cudetroplMs, liheker. 



l^ody conipressod, elevated, covered witli ctenoid scales of moderate 

 size. Dorsal and anal spini's niinienius. Teelh cdnipi-essed. lobate. 



