Plate XX. FILICALES: NEUROPTERIDAE 



1. Neuropteris flexuosa Sternberg, from Mazon Creek, U C Coll. 



No. 32028. 



2. Neuropteris clarksoni Lesquereux, from Mazon Creek, x 2/3, 



U C Coll. No. 32029. 



3. Neuropteris ovata Hoffmann, from Mazon Creek, U C Coll. 



No. 32030. 



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