?^. V. 



Plate IX. 



Royal Pkystca,l /Societt/ BdvnZwrff/v . 



17 



'^^■\'^ 



18 



~"7- . 





19 





'^ 



20 



P E.Ewen. ael. 



|i":r3,Tla,ne &, ETskine, Litk":* Edin^ 



