OF WESTERN PENNSYLVANIA 



381 



PLATE VI 



DlTRlCHUM TORTILE I 



DlTRlCHUM PALLIDUM 



P M 1 <x- 



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Tvfse" w . r 

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HF 



ipf 



UC ^,,.-%4^ 



CERATODON PURPURASCENS 



DlCRANELLA FITZGERALD! 



