212 CLASSIFICATIOX OF FISHES^ ETC. 



base ; pectorals long, pointed ; ventrals moderate : 

 representing Zanclus. 



C. longirostris. Cuv. pi. 175. 



HoLocAXTHUs Cuv., Lac. General structure of Chae- 

 todon ; fins covered with scales ; preoperculum armed 

 with a strong spine at its lower angle, 



Holocanthus Lac. Dorsal fin entire, emarginate ; 

 caudal round ; pectoral and ventral pointed. 



H. trimaculatus. Cuv. pi. 182. 



Fomacanthus, Lac. Caudal fin rounded ; margin of 

 the preopercule without serratures ; spine on the 

 lower extremity smaller than in the last ; dorsal and 

 anal fins emarginate, but with the two or three first soft 

 rays prolonged into a filament in the typical species. 



P. cingulatus. Cut. pi. 185. 



Genicanthiis Sw. Body more elongated than in the 

 two preceding ; caudal fin large, deeply lunated, the 

 ends extended into filaments ; dorsal and anal fins 

 entire ; ventral fin pointed, as large as the pectorals ; 

 operculum spined as in Holocanthus. 



Lamarckii. Cuv. pi. 184. tricolor. Bloch, pi. 426. 



Zanclus Cuv. Body higher than broad ; scales very mi- 

 nute, and hardly discernible ; dorsal fin falcated^ the 

 anterior rays surmounted by excessively long nla- 

 ments ; jaws produced into a short cy finder ; caudal 

 fin lunate ; before the eye a prominent spine ; pec- 

 toral small ; anal pointed, moderate : representing 

 Chehuon. 



Z. cornutus. Cuv. pL 177. 



Monodactylus Lac. Body diamond-shaped, broader 



than long ; dorsal and anal equal, falcate ; ventrals 



of two spiny rays, the others obsolete ; pectoral 

 small _; caudal shghtly lunate. 



Mon. falciformis. Lacepede, ii. p. 131. Cuv. pi. 18. 

 rhombeus. Griff. Cuv. pi. 55. fig. 2. 



