PLATE I. 



Fig. 1. Lepidodendron scobiniformis. 



A part of one of the smaller branches, showing the cha- 

 racter of the surface scars of the same. 



Fig. 2. Cyclopteris (Arch^opteris) AliLeghanensis. 



2«. A part of a froud, natural size. 



25. One of the pinnules magnified, to show the nervation. 



Fig. 3. Cyclopteris Virginiana. 

 3a. Part of a frond, natural size. 

 36. Outer extremity of one of the pinnse. 

 3c. One of the pinnules magnified, to show the nervation. 



Fig. 4. Carpolithes. 



