242 DIFFERENT FORMS OF CIRCULATING APPARATUS. 



Lesser circulation. 



; Heart 



Dorsal artery 



Veins 



Greater circulation. 

 Fig. 131. DIAGRAM OF THE CIRCULATION IN FISHES. 



(ZOOLOGY 305). In the lower tribes of animals we shall 



Lesser Circulation. 



Bran chio- cardiac canals 



:..._ Heart 



Veins 



Arteries 



Greater circulation. 

 Fig. 132. DIAGRAM OF THE CIRCULATION IN CRUSTACEA. 



