200 W. S. MacLeay on the Natural Arrangement of Fishes, 



From Scorptsna we proceed by means of the subgenera Sebastes 

 among the Percida, which is a family that I distinguish by having 

 seven branchiostegal rays, no mailed cheeks, no scales on the fins, 

 and always teeth on the palate. 



Probable genera of Percida, 



ABERRANT GROUP. 



Two dorsals distinct. 

 1. Perca, Linn. 



2. Opogon, Lacep. 



3. Enoplosus, Cuv. 



TYPICAL group. 



Two dorsals confluent into one. 



4. Serranus, Cuv. 



5. Ocevina, Cuv. 



Dorsal fins near. Teeth all small, 

 pveopercuhim not dentated. 



Dorsals separate, some of the teeth 

 long. 



Dorsal fins near. Preoperculum den- 

 tated. 



Teeth hooked. Preoperculum den- 

 tated. 



Teeth small, not hooked. Preoper- 

 culum not dentated. 



From Enoplosus we proceed to Ephippus among the Chatodontida, 

 or Squamipennes of Cuvier, of which the following are probably the 

 genera : — 



aberrant group. 

 No teeth on the palatines. 

 1. Ephippus, Cuv. 



2. Psettus, Comm. 



3. CHiETODON, Linn. 



normal group. 



Teeth on the palatines. 



4. ToxoTEs, Cuv. 



Dorsal emarginate, so as to show it 

 to be composed by the confluence 

 of two. Ventrals distinct. 



Dorsal not emarginate. Ventrals 

 evanescent. 



Dorsal not emarginate. Ventrals 

 conspicuous. 



Dorsal long, opposite to the anal, and 

 reaching close to the caudal. 

 5. Pempheris, Cuv. Dorsal short, opposite to the ventral, 



and far separated from the caudal. 



From Chaetodon we proceed to Amphiprion among the Sparidce, 

 which diff'er from the Chcetodontidie by having no scales on the fins, 

 and from the Percidm by having no teeth on the palatines. The fol- 

 lowing may be the natural arrangement of Sparidee into genera : — 



ABERRANT GROUP. 



SCIjENOTDES, Cuv. Operculum with spines. Preoperculum dentated. 



1. Amphiprion, £1. One dorsal. Branchial rays less than 



seven. 



2. Pristipoma, Cuv. One dorsal. Seven branchial rays. 



3. SciiENA, Linn. Two dorsals distinct. Seven bran- 



chial rays. 



TYPICAL GROUP. 



No spines on the operculum, and the preoperculum not dentated. 



4. M^NA, Cuv. Maenides, Cuv. Upper jaw extensile. 



5. Sparus, Limi, Sparoides, Cuv, Upper jaw not extensile. 



