ZOOLOGY. 171 



A very curiously forraed genus, all natives of the ocean ; 

 their flesh is in high estimation for the purposes of food, 



12. Pleuroneclus. FLouxDrR. Head small : bodj/ flat and 

 thin ; ej/es situated on the same side : gill-membrane 

 from four to seven rayed. 



This genus, contains a large variety of species, of aspects 

 widely differing, but agreeing in general, habits and cecono- 

 my. The genus is divided into such as have their eyes 

 situated on the right side, and others, in which they are 

 placed_ on the left. The species are generally known by 

 the names of Holibuts^ Flounders.^ Soles, Plaice, and 

 Turbofs ; the flesh of the Avhole genus is held in high esteem 

 for food • they all swim edgeways, and generally aff"ect 

 sandy or muddy bottoms, are very voracious, and are mostly 

 caught by the hook and line ; though some of the lesser 

 kinds are taken in nets. 



13. Choetodon. Head and mouth small; lips retractile; 

 teeth mostly in a single row, sectaceous, flexile, move- 

 able, equal, closely set and very numerous ; bod^ 

 broad, compressed, scaly ; dorsal and anal fins rigid, 

 mostly spinous ; gill-membrane from three to six rayed. 



14. Acanthurus. Teeth small, mostly lobated ; /oiV spinous 



on each side ; in other respects agreeing with the last 

 genus. 



'15. Eques. Knight-Fish. J^eth in several rows; bodjf 

 banded. ' 



