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blood 



Lumen, of 

 Heart-body 



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Fig. 2ff 



Fig. 2/. 





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Fig.2S. 





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J^L Heart-wall, muscle 



*•■">' Cotloms -f 



Fig. 36. outside <£ \ 



t «Mh ~ inside 



^ ^» ^. ■ - *_** Heart-body \ 



Invagination, 

 of Heart-wall 



body J 



