302 TEXT-BOOK OF ZOOLOGY 



and a few other species), by the spiracles, which are situated behind 



the eyes. 



The Electric Rays (Torpedo), which have the peculiar property of 

 being able to give electric shocks, are inhabitants of the warmer seas. The 

 electricity is generated in an organ which lies between the head and the 



THORNBACK RAYS. (One-eighth to one-sixth natural size.) 



The spiracles are visible behind the eyes, and in the animal in which the under surface of the 

 body is presented the apertures of the gills are seen. 



pectoral fins. It consists of a large number of small cells or chambers, 

 so that it may be compared to an electric battery composed of numerous 

 cells. The shocks serve to defend the fish against enemies and -to 

 paralyze its prey. 



Another fish possessed of still greater electric powers is the Electric 



