EXPLAXATIOiX OF THE PLATES. 



PLATE I. 



1 , Keuroiiteris Scheuchzeri , Hoffm. 



2 , Neuropteris Roger sii , Kimball. 



3, Alethopteris Sauveurii, Go pp. 

 3a , do (magnitied leaflet.) 



4, Hemitelites Trevirani, Gbpp. 



5, Sigillaria arzinensis, Cor da. 



PLATE II. 



1, Sigillaria riigosa , Brong. 



2, Sigillaria ichtJiyolcpis , Cor da. 



3, Syringodendron 2)es capreoli, Sternb. 



PLATE III. 



1, Syringodendron cyclostiyma , Brong. 



2, Zepidodendro)i dichotomum , Sternb. 



3, Lepidodendron elegans, Brong. 



4 , Lepidodendron Beyrichii , Kimball. 



