NATURAL SCIENCES OF PHILADELPHIA. 165 



brax nebulifer, the name may be restricted to it. For the second species, a 

 new generic name must be then framed : that of Atractoperca may be given. 

 Atractoperca bears nearly the same relation to that genus of which the Ser- 

 ranus scriba of the Mediterranean Sea is the type, as does Paralabrax to Epine- 

 plielus. It differs from Paralabrax by the conical head and the naked inter- 

 orbital area. 



1. Atractoperca clathrata Gill. 



Syn. Labrax clathratus Girarcl. 



Paralabrax clathratus Girard. 



II. Archoplites Gill. 



This genus is proposed for the Ambloplites interruptus of Dr. Girard. It 

 differs from Ambloplites by the greater prominence of the lower jaw, the pre- 

 sence of two bands of teeth on the tongue instead of one, and the greater 

 development and different structure of the spinous portions of the dorsal and 

 anal fins. 



2. Arceoplites interruptus Gill. 



CHjETOD oxtoid s. 



III. Parephlppus Gill. 



The American Chsetodontoids, referred to the genus Ephippus by Cuvier, 

 differ from the typical species by the smaller size of the scales and the form of 

 the dorsal fin as well as of the anal. Such differences are of generic value in 

 this group ; the American species are consequently referred to a new genus. 



Type. Parephippus gigas. 

 Syn. Ephippus gigas Cuv. 



3. Parephippus zoxatus. 



Syn. Ephippus zonatus Girard. 



POMA CENTR OIDS. 



IV. Hypsypops Gill. 



This genus is intended to embrace some fishes which have been referred to 

 Glyphisodon but which essentially differ. The head has a different form, 

 resulting from the suborhital bones, which are as high as long. The teeth 

 are also blunt and entire, and not notched at their crowns. 



4. Hypsypops rubicundus. 



Syn. Glyphisodon ribicundus Girard. 



SCORP.EXOIDS. 



V. Sebastodes Gill. 



This genus is framed for the Sebastes paucispinis of Ayres. It has a very 

 different facies from Sebastes, and is readily distinguished by the longer body, 

 the very protuberant lower jaw, which has a symphiseal swelling beneath, 

 the minute scales, the form and armature of the head, the deep emargination 

 of the dorsal fin and the emarginated caudal. 



5. Sebastodes paucispinis. 



Syn. Sebastes paucispinis Ayres, Girard. 



CHIROIDS. 

 VI. Chirus (Steller) Cuv. 

 The name of Chirus must be retained in place of Chiropsis, as the former 

 1861.] 



