CLASS OF BATRACHIANS. 



333 



arriving from the lungs, and poured into the ventricle by the 

 other auricle. This mixture penetrates into the aorta, and 



o t 



Fig 301. 



through it proceeds in small quantities to the lungs, and 

 hence to the other organs of the body. 



ap vc up 

 Fig. 302. 



* Fig. 301. The same parts as in Fig. 300 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, 

 2,3), which in the preceding tadpole were merely capillary, are now large, 



