Jour Acad Nat. Sci. 2.^ Ser. Yol.VllI. 



Pl.^. 



/<? 



£(:' 



/J> 



"''^ 



'^WM, 



^•s^r. 



fO l/rdx) crcodics. 



7/ 1/7110 circi/maxiiu^ 



i2 i'nio pa^li.?ix>i(les- 



T. Siiiclar.SiSot. Hth.Phila. 



