2 SQUAMiriNNES. 



Sijnoj^sts of the Genera. 



First groxip : Chaetodontina. Palatine or vomerine teeth none. 



Prteopercular 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. Cii^todon. 



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



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



which is filiform. Scales moderate 3. Heniochus. 



Prteoperculum with a strong spine; dorsal vrith twelve 



to fifteen spines 4. Holacanthus. 



Prseoperculiun with a strong spine ; dorsal with eight to 



ten spines 5. Pomacanthus. 



Anal with four spines ; the spinous portion of the dorsal 



not scaly, and separated from the soft by a notch ... G. Scatophaous. 



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 wliich is elongate. Pec- 

 torals short 7. Ei'iiippus. 



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 and 

 flexible. Pectorals long 8. Drepane. 



Anal mth three spines ; the spinous portion of the dorsal 

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

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

 pectorals of moderate extent 9. Hypsinotus. 



Second group : Scorpidina. Teeth on the 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. 



