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COMMON PENNSYLVANIAN FOSSILS 



CEPHALOPODS 



VERTEBRATES 



Glaphrites welteri 



Lingulo sp. 



Metacoceras cornutum 



BRACHIOPODS 



Mesolobus mesolobus vor. euampygus Wellerella tetrahedra 



Cladodus deflexus 



Petrodus 



Orbiculoidea missouriensis 



Composite] argentia 



Echinoconchus semipunctatus var. knighti 



Derbya crassa 



Juresania nebrascensis 



Linoproductus ' cora 



PLATE 1 



