SCOMBKIDiE. 



;i55 



One long dorsal fiii, witliout distinct spinous di- 

 vision ; tooth-liko processes extend into the 

 oesophagus D. Stromatftina. 



One long dorsal fin, without chstinct spinous di- 

 vision ; no teeth in the oesophagus E. Coryphsenina, 



Si/nopsls of the Genera . 



First group : Scombrina. Scombridce with two dorsal fins, the 

 spinoiLs portion being separate, and much less developed than the 

 soft. Body oblong, without or with very small scales. 



Five or six finlets ; scales equally covering the whole body ; 



two slight ridges on each side of the tail 1 . Scomber. 



Six to nine finlets ; scales of the pectoral region forming 

 a corslet ; a keel on each side of the tail ; teeth rather 

 small ; vomerine and palatme teeth 2. Tny nnus 



Seven to nine finlets (sis) ; scales of the pectoral region 

 forming a corslet ; a keel on each side of the tail ; 

 teeth of moderate strength ; palatine teeth 3. Pelamys. 



Seven to nine fuilets ; scales of the pectoral region forming 

 a corslet ; a keel on each side of the tail ; teeth very 

 small, none on the palate 4. Auxis. 



Seven or more (rarely less) fLnlete ; body naked or with 

 rudimentary scales ; a keel on each side of the tail ; 

 teeth strong 5. Cybium. 



' Finlets none ; the first dorsal reduced to a few free spines ; 



a keel on each side of the tail G. Naucrate&. 



Finlets none ; the first dorsal reduced to some free spines ; 



ventrals thoracic ; caudal keel none. . . , 7. Elacate. 



The spinous dorsal modified into a sucking organ, situated 



on the head 8. Echeneis. 



iVentrals jugular 9. Hypsipteea. 



Second (jroup : Nomeina. Scomhridw with a distinct spinous por- 

 Ition of the dorsal iin. separated from, or continuous with the soft, 

 j which is the more developed. Body oblong, covered with cycloid 

 iscales of moderate size. 



Ventrals very long ; tail with many finlets ; mouth wide. 10. GASTEROCitiSMA. 



I Ventrals long ; mouth narrow 11. Nomeus. 



I Two dorsals ; pectoral longer than the ventral ; teeth 



small; snout swollen 12. Cubiceps. 



[Two dorsals ; pectoral longer than the ventral ; teeth mi- 

 nute ; snout subconical 13. Neptomenus, 



iTwo dorsals ; pectoral and ventral rather short ; teeth 



minute 14. Platystethus. 



I-A. single dorsal, mth the posterior spines longest 15. Ditrema. 



2 a2 



