440 



The Evolution of Fishes 



Tertiary Fishes. — With the Eocene or first period of the 

 Tertiary great changes have taken place. The early famihes 

 of bony fishes nearly all disappear. The herring, pike, smelt, 



Fk;. 211. — Flyincr-fish, Cyp.9i7ur»,s hetrrnru.': (Rafinesque). Family Exnrcetida: 



Wood's Hole, Mass. 



salmon, flying-fish, and berycoids remain, and a multitude of 

 other forms seem to spring into sudden existence. Among 

 these are the globefishes, the trigger-fishes, the catfishes, the 



Fig. 2.52. — The Schoolmaster Snapper, a Pereh-like fish. 



Key West. 



Family LiiliaiiichT. 



eels, the morays, the butterfly-fishes, the porgies, the perch, 

 the bass, the pipefishes, the trumpet-fishes, the mackerels, and 

 the John-dories, with the sculpins, the anglers, the flounders, 

 the blennies, and the cods. That all these groups, generalized 

 and specialized, arose at once is impossible, although all seem 



