CHAP. XX.] FISHES, 429 



Family 13.— POLYNEMID^. (3 Genera, 23 Species.) 



" Marine or fresh-water fishes, with compressed oblong bodies 

 and entire or ciliated scales." 



DiSTKiBUTiON, — Tropical seas and rivers of both the great 

 oceans, but most abundant in the Pacific. 



Family 14.— SPHYEENID^. (1 Genus, 15 Species.) 



"Carnivorous marine fishes, with elongate sub-cylindrical 

 bodies covered with small cycloid scales." 



Distribution. — The warm and tropical seas of the globe. 



Family 15.— TRICHIUEID^. (7 Genera, 18 Species.) 



" Marine fishes, with elongate compressed bodies covered with 

 minute scales or naked." 



DiSTEiBUTiON. — All the tropical and sub-tropical seas. 



Family 16.— SCOMBEID^. (20 Genera, 108 Species.) 



" Marine fishes, with elongate compressed bodies, scaled or 

 naked." 



Distribution. — All the temperate and tropical oceans. Mostly 

 inhabiting the open seas. 



Scomber, (the Mackerel) Thynnns, Naucrates, Zeus, Centro- 

 lophus, Brama, and Lampris, are genera which have occurred in 

 the British seas. 



Family 17.— CAEANGIDtE. (27 Genera, 171 Species.) 



" Marine fishes, with compressed oblong or elevated bodies 

 covered with small scales or naked." 



Distribution. — All temperate and tropical seas ; some species 

 occur in both the great oceans, ranging from New York to Aus- 

 tralia. 



Trachwtis and Capros are genera which occur in British seas. 



