440 



The Evolution of Fishes 



Tertiary Fishes. With the Eocene or first period of the 

 Tertiary great changes have taken place. The early families 

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



Fio. 251. Flying-fish, Cypsilurus heterurus (Rafinesque). Family Exoccetidce 



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. 252. The Schoolmaster Snar 



per, a Perch-like fish. 

 Ley West. 



Family Lutianida'. 



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 



