EXPLANATIONS OF PLATES, 



PLATE I. 



Fig. 1. Schizoneura planicostata. (Catamites planicoatattts, Rogers). Pages 14 to 16. 

 Fig. 2. Rhizome of Equisetam Eogersi. f Page 11. 

 Fig. 3. Internal cast of Schizoneura, spec, f Page 16. 

 Figs. 4-6. Schizoneura Yirginiensis, spec. nov. Page 17. 



Fig. 4. Portion of a stem showing several nodes. 



Fig. 5. Fragment of a smaller stem with broader leaves. 



Fig. 6. Leaf of full size of the broader kind. 



PLATE II. 



Figs. 1, la, 2. Equiselum Bogersi, Schimper. Pages 10 to 13. 



Fig. 1. Impression of a large stem showing nodes. 



Fig. 1 a. Portion of the same magnified to show details. 



Fig. 2. Impression of a smaller stem on which the nodes are absent. 

 Fig. 3. A young plant, natural size, of Macroiesniopteris magnifolia, Rogers. Page 19. 



PLATE III. 



Figs. 1-3. Macrotaniopteris magnifolia (Rogers) Schimper. Pages 18 to 22. 

 Fig. 1. Leaf of the smaller kind, of natural size. 

 Fig. la. Probable termination of leaf given in Fig. 1. 

 Fig. 2. Young leaf of natural size. 

 Fig. 3. Tip of leaf of medium size, showing a portion of the nervation. 



PLATE IV. 



Figs. 1-4. Macrot&niopteris magnifolia, (Rogers) Schimper. Pages 18 to 22. 



Fig. 1. Leaf showing supposed fruit-dots on the stem, and at a, b, and c, the variations in the nerva- 

 tion. 

 Fig. la. Portion of the stem of Fig. 1, magnified to show more distinctly the supposed fruit-dots. 

 Fig. 2. Leaf of unusual shape, of natural size. 

 Figs. 3 and 4. Much reduced outlines, to show the two normal shapes of the entire leaves. 



PLATE V (double). 



Figs. 1-4 a. Macrotamiopteris magnifolia, (Rogers) Schimper. Pages 18 to 22. 

 Figs. 1-3. Parts of the same leaf of M. magnifolia, of the largest size commonly attained. 

 Fig. 1. Base of the leaf. 

 Fig. 2. Middle portion of the same. 

 Fig. 3. Summit of the same. 

 Fig. 4. Nervation of the same magnified to show the compound nature of the lateral nerves. 

 Fig. 4 a. A. lateral nerve of Fig. 4 still more magnified. 

 Fig. 5. Macrotamiopiteris crassinervis, Feist. Pages 22 to 23. Fragment of a frond of the largest size. 

 9 F 129 



