120 ORDER ACANTHOPTERYGII. 



salient angle is in form of a spine, itself denticulated. 

 They are found in the seas of warm countries \ 



Dules, Cuv. 



Have, like centropristres, the operculum terminated in 

 a spine, the preoperculum is denticulated, and the 

 teeth are even ; but their branchial membrane has 

 only six rays 2 . 



There is one, D. ritpestris, Cuv. in the fresh waters 

 of the Isle of Bourbon, and the Isle of France, some- 

 thing like a carp, and esteemed for its flavour 3 . 



Therapon, Cuv. 



Have a denticulated preoperculum, the operculum is 

 terminated by a strong spine ; only one dorsal fin with 

 a deep depression between the spiny and the articu- 

 lated parts ; the exterior range of teeth are stronger 

 than the others, and pointed. In some the teeth of 

 the vomer fall early. They are Indian fish, remarkable 

 for having the swimming-bladder naturally divided into 

 two by a ligature 4 . 



Anthias macrophtalmus, Bl. 319. or Catalufa, Parra. xii. 1. 

 Anthias boops, Bl. Schn. 308. Sclaena hamruhr. Forsk. Labrus 

 cruentatus, Lacep. iii. 2. 2. and the other species described in our 

 third volume. 



2 Dules auriga, Cuv. andVal. iii. 51. D. tceniurus, ib. 53. and 

 the other species described in our third volume. 



1 Centropome de Roche, Lacep. iv. 273. 



1 Holocentrus semis, Bl. 238. 1. or Sciccna jerbua, Forsk. Hoi. 



