192 



PISCES. 



Naucrates (Cuv.). Pilot-fish. As in Centrolophus, 

 but there are free spines before tKe dorsal and anal ; 

 sides of the tail keeled. 



N. ductor. Fig. 302 ; 1 71. s. 



Xipliias (Linn.). Swordfish, One dorsal very- 

 high in front ; ventrals wanting ; anal large ; 

 caudal high, and crescent-shaped ; upper jaw pro- 

 longed into a hard sword-like beak. 



X. gladius. Fig. 303 ; ^n.s. 



303 



304 



Scomber (Linn.). Mackerel. Body gracefully 

 shaped, smooth, brilliant, clothed with minute 

 scales ; two dorsals remote from each other ; second 

 dorsal and anal cut into triangular finlets j tail 

 crescent-shaped. 



S. scombrus. Fig. 304 ; 1 71. s. 

 colias. 



Tliynnus (Cuv.). Tunny. Large scales on the 



