244 



CLASSIFICATION OF FISHES^ ETC. 



Tetragonur US Risso. (fig- 69.) General form of Elacate, 

 but the dorsal and anal fins are much shorter_, and 

 there are two ridges on each side of the tail^ at the 

 base of the caudal (a) ; before the dorsal a series of 

 detached spines ; scales small but hard^ deeply stri- 

 ated (6), and crenated on the edges ; mouth nearly 

 vertical ; lower jaw with a row of acute teeth, and 

 others in the palate and vomer : the cheloniform type ? 

 T. Cuvieri Risso. Griff. Cuv. pi. 51. fig. 2. 



Chorinemus Cuv.* Body elongated as in the mackerel, but 

 the general shape of the head and position of the dor- 

 sal and anal fins as in Elacate ; mouth large, opening 

 obliquely ; gape reaching in a line with the eye ; 

 detached spines before the dorsal and anal ; both fins 

 long, falcate before and very narrow behind, where 

 the ravs are detached into finlets ; caudal lunate, 

 without any carinated ridges at its base ; pectoral 

 small, equal to the ventral ; lateral hne sinuated. 

 Ch. maculatus Sw. Cuv. pi. 236. 



Forthmeus Cuv. Small, oblong-oval ; head pointed ; 

 mouth very wide^ opening beyond the eye ; lower 

 jaw much the longest ; the chin rather pointed ; 

 dorsal spines connected at their base by a slight mem- 

 brane ; pectoral and ventral as in the last ; caudal 

 forked ; preoperculum obsoletely spined.f 

 P. argenteus Cuv. pi. 264. fig. 2. 



* This sub-genus bears a strong resemblance to that of Scomber proper, 

 by the detached dorsal finlets, but in every other respect it has the closest 

 possible affinity to Elacate. 



+ This type 'seems to connect the Elacatte with the Trachince by means 

 of Zonichthys. 



