84 Morphology of the Fins 



as the name (ye^vpos, bridge; /cep/cos, tail) is intended to 

 indicate. Such a tail has been recognized in four genera only, 



FIG. 68. Isocercal tail of Hake, Merluccius productus (Ayres). 



FIG. 69. Homocercal tail of a Flounder, Paralichthys californicus. 



Mola, Ranzania, Fierasfer, and Echtodon, the head-fishes and 

 the pearl-fishes. 



