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MANUAL OF ELEMENTARY ZOOLOGY 



veins from the liver, through which organ it passes on its way 

 to the heart. Blood from the stomach, intestines, pancreas, 

 and spleen is carried to the liver by the portal vein, but 

 there is no renal portal system. The general course of the 

 circulation of the blood in the rabbit is shown in the table 

 below. 



Most of the lymphatic vessels are gathered up into a 

 thoracic duct which opens into the left subclavian vein at 



Right auricle 

 Riqhr ventricle 



4 . 



l_unqs 



■ 1 > 



Lefr auricle 

 Lefr ventricle 



Head 



Right auricle 



Fig. 330. — A diagram of the circulation of the blood in the rabbit. 

 Thick lines indicate venous blood, narrow lines arterial blood. 



its junction with the external jugular, but those of the right 

 side of the head and neck and right fore-limb communicate 

 with the venous system in the corresponding position on 

 the right side. (The arrangement of the main lymphatic 

 vessels of man, which is substantially the same as that of 

 the rabbit, is shown in Fig. 351.) 



The blood of the rabbit differs from that of the frog 



and dogfish in two important respects. (1) The 



red corpuscles, instead of being oval in outline 



and biconvex, with nuclei, are round and biconcave and 



