SCOMBRIFORMES 



465 



Family Scoaibridae. The anal and posterior dorsal fins are broken 

 up behind into a series of finlets each supported by a radial. The spinous 

 dorsal folds back into a groove. From thirty to fifty vertebrae, and the 

 pectoral fins inserted high up. Gastrochisma lias enormous pelvics, which 

 fold into a ventral groove (Fig. 494). 



PlG.'492. 



Si miophorus veliccms, Bl. ; Upper Eocene, Monte Bolca. (From GMinther, after Agassiz.)| 

 A, anal, C, caudal, and D, dorsal tin. 



Isurichthys, A. S. W. ; Palimphyes, Ag. — Oligocene, Europe. Eothynnus, 

 A. S. W. ; Scombrinus, A. S. W. ; Sphyraenodus, Ag. — Eocene, Europe. 

 Cijbium, Cuv. ; Auxis, Cuv. ; Thynnus, Cuv. (Fig. 493) — Atlantic, Indian 

 Ocean ; and Eocene, Europe. Scomber, L. ; warm and temperate seas ; 

 and Oligocene, Europe. Sarda, Cuv. ; Acanthocybium, Gill ; Gastrochisma, 

 Rich. (Fig. 494). 



