2 aatTAMrprNiTEs. 



Synopsis of the Genera. 



First group : Chsetodoiitina. Palatine or vomerine teeth none. 



Prseopercular spine none. A single dorsal, without any 

 notch, and with the spinous portion well developed ; 

 none of the spines elongate. Muzzle short or of 

 moderate length 1 . Ch^todon. 



Muzzle very long ; scales moderate, or rather small 2. Chelmo. 



One dorsal, with eleven to fourteen spines, the fourth of 



which is filiform. Scales moderate 3. Heniochus. 



Prscoperculum with a strong spine; dorsal with twelve 



to fifteen spmes 4. Holacanthus. 



Praeoperculum with a strong spine ; dorsal with eight to 



ten spmes 5. Pomacanthus. 



Anal with four spines ; the spinous portion of the dorsal 



not scaly, and separated from the soft by a notch ... 6. Scatophagus. 



Anal with three spines ; the spinous portion of the dorsal 

 not scaly, separated from the soft by a deep notch, 

 with nine spines, the third of which is elongate. Pec- 

 torals short 7. Efhippus 



Anal with three spines ; the spinous portion of the dorsal 

 not scaly, separated from the soft by a deep notch, 

 with nine spines, the tliird of which is elongate and 

 flexible. Pectorals long 8. Drepane. 



Anal with three spines ; the spinous portion of the dorsal 

 not scaly, separated from the soft by a deep notch, 

 with eight spines, the second of which is the longest ; 

 pectorals of moderate extent 9. Hvpsi.notus. 



Second group : Scorpidina. Teeth on ihe palate. Dorsal fin 

 occupying the middle of the back. (Australian Seas.) 



One dorsal, with nine to ten spines, the posterior of which 



are the longest 10. Scorpis. 



One dorsal, with eleven spines, the middle of which are 



the longest %... 11. Atypus. 



Third group : Toxotina. Teeth on the palate. Dorsal fin occu- 

 pying the posterior half of the back. 



One dorsal, with five spines 12. Toxotes. 



