192 



ANNUL ATA. 



Fig. 118. — First Dissection of 

 Leech [Hirudd). 

 (Ad nat. ) 

 Brain. 



Fig. 119. — Second Dissection 



OF Leech {Hirudd). 



(Ad nat. ) 



Brain. 



The body-wall is cut open along the 

 mid dorsal line and pinned back. 



The alimentary canal is picked out, and 

 the nervous, blood-vascular, genital 

 and excretory organs are exposed. 



