PHYLUM OHORDATA 



283 



diminishing, owing to the continual flow of blood towards the 

 capillaries. Very soon, therefore, the blood forces the valves 





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aside and makes its way into the bulbus aortse. Here again the 

 course taken is that of least resistance : owing to the presence of the 

 carotid labyrinth the passage of blood into the carotid trunks is 

 less free than into the wide, elastic, systemic trunks. These will 



