178 CLASSIFICATION OF FISHES^ ETC. 



5. Sub-family Acaxthurix^. — Body ovate, oblong; tail 

 armed -n-ith lateral spines. 



* Ventrals three-rayed. 



AuxiNURCs. Body oval, coriaceous ; tail unarmed, with a 

 single flat fixed plate. 



Priodox. Coriaceous ; no spines on the tail. 



Xaseus. Pront prolonged into a horizontal horn. 



* * Ventrals five-rayed. 



AcANTHURUs. Sides of the tail with a single moveable spine 



Acanthurus. Caudal fin truncate ; body scaly. 

 Teuthys. Caudal fin sub-forked : body coriaceous, without scales. 

 Ctenodon. Caudal large, lunated : body scaly ; dorsal fin undivided. 

 Harpurus. Mouth contracted and produced, somewhat tubular. 

 Zeb)-aso?na. Mouth pointed ; dorsal and ventral fins very broad. 



Prionurus. Sides of the tail with two or more spines ; body 



without scales. 



CalUdermes. Snout obtuse : caudal lunated ; caudal spines two. 

 Aspisurus. Mouth contracted and somewhat tubular ; caudal truncate. 

 Prionurus. Caudal spines immoveable. 



Tribe ITT. GYMXETRES. Riband Fish— Bodx long, re^. 

 markably thin; dorsal fin extending the length of the back; 

 ventrals large. 



1. Sub-family PTERACLix.aE. 



Ptzracles. Dorsal and anal fins excessively broad. 



2. Sub-family Gvmketrin^. — Caudal fin horizontal, very 



small. 



LoFHOTES. Ventrals minute ; first dorsal ray horn-like. 

 Gymxetrus. Ventrals long, oar-shaped. 

 XiPHicHTHTs. Excessively long ; ventrals long, filiform. 

 Xemotherus. Xo ventral or anal fins ; caudal with a long 



filiform ray. 

 GinixoGASTER. Xo ventrals ; lateral line carinated and spinous. 



3. Sub-family Trachtpterik^. — Caudal and ventral fins 



large, 



Cephalepes. Dorsals two, the first with a long spatulate ray. 



Argycthius. Dorsal fin single ; ventrals long, subulate, of 

 three united ravs. 



