EXPLANATION OF PLATES. 137 



PLATE XL. 



Ctenophyllum grandifolium, spec. nov. Pages 73 to 76. Represents the basal portion of a very large 

 leaf of this plant. The leaflets extend to 12 and 18 inches in width. 



PLATE XLI (double). 



FlGS. 1,2. Ctenophyllum grandifolium, spec. nov. Pages 73 to 76. 



Fig. 1. Represents the middle portion of the same leaf whose base was given on Plate XL. 

 Fig. 2. Lower portion of the plant given on Plate XL 



PLATE XLII (double). 



FlG. 1, la, 16. Ctenophyllum grandifolium, spec. nov. Pages 73 to 76. 



Fig. 1. Represents the summit of the same large leaf whose base is given on Plate XL, and middle 

 portion in Fig. 1, Plate XLI. 



Fig. 1 a. Represents the middle portion of a leaflet of Fig. 1, magnified to show the parallel posi- 

 tion of the nerve-bundles. 



FlG. 1 1. Represents a portion of the base of a leaflet of Fig. 1, still more magnified, to show the 

 complex nature and mode of splitting upof the nerve-bundles at their base. 

 FIGS. 2-5. Fodozamites tenuistriatus, spec. nov. Pages 78 to 79. 



Fig. 2. Gives a fragment of a leaf of the largest form. 



Fig. 3. Gives a portion of a leaf of normal size. 



FlG. 3 a. Leaflet of Fig. 3, magnified to show nervation. 



FlG. 3 6. Tip of Fig. 3 a, still more magnified to show convergence of the nerves at their ends. 



Fig. 4. Fragment of a plant showing insertions of leaflets perhaps flattened from above. 



Fig. 5. Leaflet of largest size. 



PLATE XLIII. 



Fig. 1, 1 a. Sphenozamites Rogersianus, spec. nov. Pages 80 to 84. 



Fig. 1. Summit of a leaf of medium size. 



Fig. 1 a. Belongs to the lowest leaflet on the right-hand side. 

 Fig. 2. Pterophyllum decussatum, Emmons. Page 67. 



Fig. 2. Gives the insertion and basal portions of two leaflets. 



PLATE XLIV. 



Figs. 1-2 6. Sphenozamites Rogersianus, spec. nov. Pages 80 to 84. 



Fig. 1. Portion of the middle part of a leaf of normal size. 



FlG. 2. Nervation magnified to show the granulation. 



Fig. 2 a. Nervation magnified to show the complexity of the nerves and their mode of forking from 

 the base. 



Fig. 2 6. Nervation still more magnified to show the elongation of the dots into cross-bars. 

 FlG. 3. Podozamites tenuistriatus, spec. nov. Pages 78 to 79. Shows a form with leaflets broad near the 



insertions. 

 FlGS. 4-6. Cycadites tenuinervis, spec. nov. Page 84. 



Fig. 4. Represents the upper part of a leaf. 



Fig. 5. Represents the middle part of a leaf. 



FlG. 6. Represents a small form. 



