208 



INTEODirCTION TO ZOOLOGY. 



sufficiently powerful to reduce it to a pulp. To some the 

 dead animal body seems to be not less acceptable than the 



Branchial Artery 



Arterial Bulb ».^ 



Ventricle-.. ._ 



Auricle , 



Venous Sinus— —- 



Vena Porta 



Intestine 



Vena Cava— 



Vessels of the Gills 



Dorsal Artery 



" Kidnej-s 



Dorsal Artery 



Fig. 184.— CiECULATisG Appabatds of Fish. 



living. Star-fishes, Crustacea, and such moUusea as are not 

 too bulky or too well defended, constitute a large portion of 

 the food of many fishes ; and to this must be added the young 



