200 W. S. MacLeayow the Natural Arrangement of Fishes, 



From Scorpcena we proceed by means of the subgenera Sebastes 

 among the Percidce, which is a famil}- that I distinguish by having 

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

 and always teeth on the palate. 



Probable srenera of Percidce. 



ABERRANT GROUP. 



Two doi'sals distinct. 



1. Perca, Linn. 



2. Opogon, Lacej). 



3. ExoPLosus, Cuv. 



TYPICAL GROUP. 



Two dorsals confluent into one. 



4. Serranus, Cuv, 



5. OCEVINA, Cuv. 



Dorsal fins near. Teefli all small, 

 pveoperculum not dentated. 



Dorsals separate, some of the teeth 

 long. 



Dorsal fins near. Preoporcidum den- 

 tated. 



Teeth hooked 



tated. 

 Teeth small, not hooked 



culum not dentated. 



Preoperculum den- 

 Preoper- 



From Enoplosus we proceed to Epliippiis among the Cha:todontid<e, 

 or Squamipenxes of Cuvier, of which the following are probabl)" the 

 srenera : — 



ABERRANT GROUP, 



No teeth on the palatines. 

 1. Ephippus, Cuv. 



2. PsETTus, Comm. 



3. Ch/Etodon, Ltmi. 



NORMAL group. 



Teeth on tlie 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 Chcetodon we proceed to Amphiprion among the Sparidee, 

 which chffer from the ChcEtodontidee by having no scales on the fins, 

 and from the Percida by haA-ing no teeth on the palatines. The fol- 

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



aberrant group. 

 SCIjENOIDES, Cuv. 

 1. Amphiprion, £1. 



Operculum with spines. Preoperculum dentated. 

 One dorsal. Branchial rays less than 

 seven. 



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



3. Sci.i2NA, Linn. Two dorsals distinct. Seven bran- 



chial rays. 

 typical group. 

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



4. MyT.NA, Cuv. Maenides, Cuv. Upper jaw extensile. 



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



