SCOMBRIFORMES 



467 



divided dorsal. The pectorals are small. The pelvics fold into a groove. 

 About thirty vertebrae. Small cycloid scales, and large teeth. No air- 

 bladder. 



Coryphaena, Art. 'Dolphin' ; warm seas. 



FIG. 490. 

 ixiudutii.s, Euplir. (After Giiuther.) 



Family LUVARIDAE. With a large head and very short snout, but 

 the dorsal fin tar back, and a very feeble dentition. About twenty-three 

 vertebrae. The pelvic bones are fused, and the pelvic fins small. There 

 is a small gill-opening. The post-temporal is enormous. 



Luvarus (Aiisonia), Raf. ; Mediterranean, Atlantic, Pacific. 



4. The body becomes much lengthened, and the jaws produced into 

 a sharp rostrum. The dorsal and haemal spines expand into flattened 

 plates. The teeth are minute or absent. 



Fiu. 41*0. 

 Trichiurus h^tums, L. (From Jordan and Evermann.) 



Family PALAEORHYNCHIDAE. The ribs completely encircle the 

 abdomen. The pectoral fins are small, and the pelvic fins large. From 

 fifty to sixty vertebrae. 



Hemirhynchus, Ag. ; Eocene, Europe. Palagorhynchus, Bl. ; Oligocene, 

 Europe. 



Family HISTIOPHORIDAE. The lengthened lower jaw bears a pre- 

 dentary bone. The dorsal and anal fins more or less subdivided ; the 



