122 ORDER ACANTHOPTERYGII. 



and the operculum is terminated in a flat point. They 

 have no scales ; their mouth is cleft almost vertically. 

 Only one is known. 



Tr. Stetteri, Cuv. Trachinus trichodon, Pall. Mem. de Perers. 

 iv. 15. 8. Cuv. and Val. iii. 57. 



From the northern part of the Pacific ocean \ 



SlLLAGOj Cuv. y 



With the head a little elongated towards a point, the 

 mouth small, the teeth even in the jaws, and on the 

 front of the vomer ; the operculum terminating in a 

 small spine, six branchial rays, two contiguous dorsal 

 fins, the anterior with slender spines, the posterior 

 long, and but little elevated. 



These are fish of the Indian seas, very much es- 

 teemed for their flavour, and the lightness of their 

 flesh. 



The most remarkable species is 



Sillago domina, Cuv. 



Brownish, and is distinguished by having the first ray 

 of the dorsal fin elongated into a thread as long as the 

 body. Its head is scaly, and the eye very small. 

 There is another, 



This fish having neither jugular ventrals, nor an elongated 

 posterior dorsal fin, nor a strong spine on the operculum, nor seven 

 rays to the gills, cannot be a trachinus as Pallas and Tilesius thought. 



