Ttfommrs'Rnston Soc.Nat.Hist.Vol.T. 



Plate 2 



#4rCv 



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a 



9 i 



4A-* 



16 i 



A.Winchell del. 





V 





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18 



5* 



Ml 



% 



P 



13 I 



'^'Siaa—- 



L Tt ouvelot on stem* 



Wmchell & Marcy on the fossils of the Niagara Limestone at Chicago, 111. 



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