608 



ZOOLOGY 



SECT. 



these it is carried by a series of veins to the pericardial sinus to 

 enter the heart through the ostia. 



The organs of respiration in the Scorpions are in the torm < 

 pul,,i onary sacs or book-lungs (pul.\ the stigmata or external openings 



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J i|f 



? c. 2 t. 

 - t- a .2 



of which have already been referred to. Each pulmonary sac is 

 a compressed chamber lined with a thin cuticle. The lining 

 membrane is raised up into numerous delicate lamin?e lying 

 |iarallel with one another like the leaves of a book. Into the 



