170 CLASSIFICATION OF FISHES, ETC. 



AMiLT 2. CH^TODONIDiE. 



Operculum generally smooth, or without prickles * ; spinal rays 

 of the dorsal fin fewer than the flexible rays ; body generally 

 oval; mouth small. 



1. Sub-family Ch^todonid^. — Short, broad; fins covered 

 with scales ; teeth setaceous, j* 



Ch^etodon. Operculum smooth, or without spines. 



Microcanthus. Anterior dorsal fin naked ; operculum minutely cre- 



nated. 

 Chcetodon. Dorsal fin of nearly equal breadth throughout. 

 Rabdophorits. Dorsal fin prolonged into a whip-like filament. 

 - Zanclus. Dorsal fin very falcate ; snout produced ; scales obsolete. 

 Chelmon. Snout excessively prolonged. 



HoLocANTHUs. Operculum denticulated, or strongly spined. 



Heniochus. Dorsal fin falcated ; front homed ; scales distinct. 

 Pomacanthus. Operculum serrated ; dorsal fin attenuated behind. 

 Holocanthus. Operculum with a large spine ; caudal rounded. 

 Genicanthus. Operculum spined ; body lengthened ; caudal forked. 



Ephippus. Dorsal fins partly naked ; front gibbous, truncate. 



Drepane. Pectoral fins very long and falcate ; caudal truncate. 



Monodactylus. Soft rays of the ventral fins almost obsolete. 



Platax. Ventral fins generally very long and falcate. 



Ephippus. Dorsal fins two, with minute prickles before; pectorals 

 small, rounded. 



Scatophagus. No spines before the dorsals, which are united ; pec- 

 torals pointed. 



ToxoTES. Body oblong ; mouth large, sub-vertical ; lower 



jaw longest. 



Toxotes. Dorsal fin close to the caudal ; caudal truncate. 

 Pempheris. Dorsal fin short and high, placed over the pectoral. 

 Brama. Dorsal fin long, falcate ; caudal forked. 



Geeres. General aspect of Sparus ; mouth very protractile ; 



dorsal fins sheathed or scaled at the base ; 



caudal deeply forked ; teeth setaceous. 



Gerres. Dorsal fin sheathed, its anterior and anal spines very strong. 

 C^sio. Small scales extending half-way up the dorsaL 

 Mena. Fusiform; dorsal naked; teeth minute, 

 'i Smaris. Resembling Mena, but no teeth on the vomer. 



2. Sub-family Scim^vsm. — Gill-covers spined ; preopercu- 

 lum serrated, resembling the Percidae, but the vomer 

 and palate without teeth, 



Glyphisodon. General form of Chjetodon, but the teeth are 

 strong. 

 Pimelepterus. Ovate, oblong^ dorsal fins two ; snout obtuse, notched. 



• Except in Toxotes. + Except in the Scienin^s. 



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