266 



Correspondence. 



Aberrant Group, 

 Head either tuber- 

 culous or spinous, 



Normal Group. 



Head neither tuber- 

 culous nor spin- 

 ous. 



Scorpsenidse, which family agrees with the group called Buccas Lori- 

 catse by Cuvier. But it is rather a stirps than a family, and the follow- 

 ing genera ought to be deemed of the rank of families. 



Free spines in lieu of first 



dorsal. 

 Two distinct dorsal fins. 

 Two dorsals more or less 



confluent. 

 Ventrals complete. Free 

 cones in lieu of first dorsal. 

 Ventrals reduced to a spine 

 or spines. Free spines 

 in lieu of first dorsal. 



* 1. Monocentris, 

 Linn. 



2. Trigla, Linn. 



3. Scorpjena, Linn. 



•4. Orcosoma, Cuv. 



5. Gasterosteus, 

 Linn. 



For subgenera, I must always refer to Cuvier and Valenciennes. 



From Scorpsena we proceed by means of the subgenera Sebastes 

 among the Percidse, 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 Percidse. 



Aberrant Group. 



Two dorsals 

 tinct. 



dis-^ 



I 



Typical Group. 



1. Perca, Linn. 



Opogon, Lacep. 

 Enoplosus, Cuv. 

 Serranus, Cuv. 



Two dorsals con- J 5. Ocevina, Cuv. 



fluent into one. 



1 

 I 



Dorsal fins near. Teeth all 

 small, preoperculum not 

 dentated. 



Dorsals separate, some of 

 the teeth long. 



Dorsal fins near. Preoper- 

 culum dentated. 



Teeth booked. Preopercu- 

 lum dentated. 



Teeth small, not hooked. 

 Preoperculum not den- 

 tated. 



From Enoplosus we proceed to Ephippus among the Chsetodontidae, or 

 Squamipennes of Cuvier, of which the following are probably the genera — 



Aberrant Group. 



1. Ephippus, Cuv. 



No teeth on 

 palatines. 



the 



i 



2. Psettus, Comm. 



3. Chjetodon, Linn. 



Dorsal emarginate, so as to 

 shew it to be composed 

 by the confluence of two. 

 Ventrals distinct. 



Dorsal not emarginate. 

 Ventrals evanescent. 



Dorsal not emarginate. 

 Ventrals conspicuous. 



