362 SYNOPSIS. 



256 ; Yarr. Brit. Fish., i. p. 164; Penn. Brit. Zool, nu 



p. 216, pi. 30. 



Gen. XXVI. Naucbates. Body thick and covered with small 



scales ; dorsal single and elongated, and both it and the anal 



with free spinous rays placed in advance of them ; sides of the 



tail keeled ; jaws equal. 



Sp. 49. N. ductor. Pilot-fish. Snout somewhat rounded, 

 lower jaw slightly projecting; teeth very small and nu- 

 merous, a single strong tooth in front of the vomer and 

 another on the tongue ; dorsal and anal fins ending on the 

 same line ; caudal acutely forked ; colour greyish blue, 

 glossed with silver, with five broad, regular, dark bands 

 round the body ; pectoral fins clouded with white and 

 blue, ventral dnsky.—Cuv, & Yal., viii. p. 312, pi. 232 ; 

 Yarr. Brit. Fish., i. p. 170. Gasterosteus ductor, Lirm. 

 Centronotus ductor, Jenyns' Brit. Vert., p. 365. 

 Gen. XXVII. Caranx. Body covered with small scales, 

 the lateral line cuirassed with large imbricated scales, forming an 

 elevated ridge, especially in the posterior portion ; dorsals two, 

 distinct, the anterior having a reclined spine in front of it ; free 

 spines before the anal. 



Sp. 50. C. trachurus. The Scad, or Horse-Mackerel. Lower 

 jaw projecting considerably beyond the upper ; lateral line 

 parallel with the back till opposite the commencement of 

 the second dorsal, where it bends obliquely downwai'ds ; 

 second dorsal and anal fins nearly of equal length and the 

 same shape, in front of the latter two sharp spines united 

 by a membrane, caudal deeply forked ; colour leaden-grey 

 variegated with blue and gi-een, silvery beneath ; opercu- 

 lum with a black spot. — Lacepede, Cuv. ^ Vol., ix. p. 11, 

 pi. 246. Scomber trachurus, Linn. Scad, Pmn. Brit. 

 Zool., iii. p. 363, pi. 62; Don. Brit. Fish., pi. 3. 

 Gen. XXVIII. Centrolophus. Dorsal fin single and elon» 

 gated, commencing on a line -vv^th the pectoral, anal fin half as 

 long as the dorsal ; teeth small and numerous, the palate with- 

 out teeth ; tail not keeled, 



Sp. 51, C. pompiliis. Black fish. Body compressed, the 



