102 



BRANCH VERTEBRATA. 

 FIG. 174. 



Per' ca, amerlca.'na. Yellow Perch. (J.) 



Perch are found both in salt and fresh water. They 

 can be kept alive in the air for hours by occasionally 

 pouring water upon their gills. 



ORDER ANACANTHANI (an a kan tha'nl). 



The Cod is caught in deep seas with hook and line. 

 It is so numerous in certain localities that eight men 



FIG. 175. 



Mor' rhu a, a mer I ca' na. 



have taken eighty score in a single day. Nine millions 

 of eggs have been found in the roe of one female. The 

 Cod holds the proud distinction of having the greatest 

 economical value of any fish. 



ORDER HETEROSOMATA (het er o som'a ta). 



The Remora (rem'o ra), or Suck-fish, has on its head 

 a flat disk, not unlike the sole of an India-rubber shoe. 

 This enables it to cling to rocks, vessels, and even to 



