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List of Abbreviations. 



Muscle -fibres of bladder. 



Nerve cord. 



Nucleus of central cell of funnel. 



Nucleus of coelomic epithelium. 



Neplu'ostomial duct. 



1-5. First to fifth nephridiiim. 



Nephi'idial pore. 



Nuclei of margmal cells. 



Narrow tube connecting the bladder 

 with nephridioporc. 



Nucleus of bladder -wall. 



Outlet-duct. 



Posterior fold. 



Protoplasmic processes of lining of 

 bladder. 



Septum. 



Spur. 



Pomt in the spm' where the outer 

 narrow canal passes under the 

 other canals to reach the oppo- 

 site side. 



Ventral blood -trunk. 



Ventral lip of funnel. 



Whip or flame of cilia at entiance 

 to ampulla. 



Junction of nephrostomial duct and 

 anterior fold. 



Junction of nephrostomial duct and 

 fimnel-duct. 



