ILLUSTRATIONS 



PLATE PAGE 



I Reconstruction of swamp forest in Pennsylvanian time. After H. Potonie. 20 



II Equisetales from La Salle and Braidwood regions 22 



III Equisetales from Mazon Creek and Braidwood regions 24 



IV 7 Equisetales from Morris and Mazon Creek regions 26 



V Equisetales from Mazon Creek and Braidwood regions 28 



VI Sphenophyllales from Mazon Creek and Braidwood regions 30 



VII Lycopodiales from Mazon Creek region 32 



VIII Lycopodiales from Braidwood and Mazon Creek regions 34 



IX Lycopodiales from Mazon Creek region 36 



X Lycopodiales from Mazon Creek region 38 



XI Lycopodiales from Braidwood region 40 



XII Lycopodiales from Braidwood 42 



XIII Filicales: Sphenopteridae from Braidwood and Mazon Creek regions. ... 44 



XIV Filicales: Sphenopteridae from Mazon Creek region 46 



XV Filicales: Megalopteridae from Port Byron 48 



XVI Filicales: Mariopteridae from Mazon Creek and Braidwood regions 50 



XVII Filicales: Neuropteridae from Spring Valley and Mazon Creek regions. . 52 



XVIII Filicales: Neuropteridae from Mazon Creek and Braidwood regions 54 



XIX Filicales: Neuropteridae from Braidwood region 56 



XX Filicales: Neuropteridae from Mazon Creek region 58 



XXI Filicales: Neuropteridae from Mazon Creek region 60 



XXII Filicales: Neuropteridae from Mazon Creek region 62 



XXIII Filicales: Neuropteridae from Mazon Creek 64 



XXIV Filicales: Neuropteridae from Mazon Creek and Braidwood regions 66 



XXV Filicales: Neuropteridae from Braidwood and Mazon Creek regions .... 68 



XXVI Filicales: Neuropteridae from Mazon Creek region 70 



XXVII Filicales: Neuropteridae from Mazon Creek and Braidwood regions 72 



XXVIII Filicales: Various fern leaf types from Mazon Creek region 74 



XXIX Filicales: Pecopteridae from Mazon Creek region 76 



XXX Filicales: Pecopteridae from Mazon Creek region 78 



XXXI Filicales: Pecopteridae from Mazon Creek region 80 



XXXII Filicales: Pecopteridae from Braidwood region 82 



XXXIII Filicales: Pecopteridae from Morris region 84 



XXXIV Filicales: Pecopteridae from Mazon Creek region 86 



XXXV Filicales: Pecopteridae from Mazon Creek region 88 



XXXVI Filicales: Pecopteridae from Mazon Creek region 90 



XXXVII Filicales: Odontopteridae from Mazon Creek region 92 



XXXVIII Filicales: Alethopteridae from Mazon Creek and Braidwood regions 94 



XXXIX Filicales: Alethopteridae from Mazon Creek region 96 



XL Filicales: Alethopteridae from Mazon Creek region 98 



XLI Filicales: Callipteridae from Mazon Creek region 100 



XLII Cycadofilicales: Reproductive organs. From Mazon Creek region 102 



XLIII Cycadofilicales: Reproductive organs. From Mazon Creek and Braid- 

 wood regions 104 



XLIV Cycadofilicales and Cordaitales: Reproductive organs. From Braidwood 



and Mazon Creek regions 106 



XLV Cycadofilicales, Cordaitales, and fern stems from Mazon Creek, Braid- 

 wood and Coal City 108 



