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



From Scorpcena we proceed by means of the subgenera Sebastes 

 among the Pcrcida, 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 Percidce. 



ABERRANT GROUP. 



Two dorsals distinct. 



1. Perca, Linn. 



2. Opogon, Lacep. 



3. Enoplosus, Cuv. 



typical group. 

 Two dorsals confluent into one 



4. Serranus, Cuv. 



Dorsal fins near. Teeth all small, 

 z preoperculum not dentated. 

 Dorsals separate, some of the tooth 

 long. 



Dorsal fins near. Preoperculum den- 

 tated. 



Teeth hooked. Preoperculum den- 

 tated. 



5. Ocevina, Cuv. Teeth small, not hooked. Preoper- 



culum not dentated. 

 From Enoplosus we proceed to Epldppus 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. 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. 



2. Psettus, Comm. 



3. Ch^todon, Linn. 



NORMAL GROUP. 



Teeth on the palatines. 



4. Toxotes, Cuv. 



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 Chatodon we proceed to Amphiprion among the Sparidce, 

 which differ from the Chcetodontidce by having no scales on the fins, 

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

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



aberrant group. 

 SCIjENOIDES, Cuv. 



1. Amphiprion, Bl. 



2. Pristipoma, Cuv. 



3. Sci^na, Linn. 



Operculum with spines. Preoperculum dentated. 



One dorsal. Branchial rays less than 

 seven. 



One dorsal. Seven branchial rays. 

 Two dorsals distinct. Seven bran- 

 chial rays. 



typical group. 



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



4. M/ena, Cuv. Mfenides, Cuv. Upper jaw extensile. 



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



