ZOOLOGY. 



artery, whose branches ramify in the different organs (Fig. 

 375). We have already seen, that in fishes the blood follows 



op 



Fig. 376.* 



the same course ( 109), but when the lungs are developed, 

 the disposition of the vascular apparatus changes ; a direct 



brl 



* Fig. 376. The same parts as in Fig. 375 in a tadpole, in which the 

 branchiae begin to lose their importance, and in which a part of the blood 

 proceeds from the heart to different parts of the body without traversing 

 these organs. The same letters indicate the same vessels as in the pre- 

 ceding figure, and it will be remarked that the anastomotic branches (1, 2, 



