The Monttily l\Iicroscopical Joiimal Ma.vl .187 



PI. LI. 



Vi^wcL J^r'ticaJly 



YmXraL oLsvect. 



Viewed' from above 



m^ 



Tellet Cwp. 



: OJoitL i&lTaf£en"West So 



Diagrams 



lihistrauUna, the (bvurses of Ike Currents rroSuced, iy the 

 Dzsc of MeHcerto^. 



W. West jiap . 



