aoe NOS Ts ae ll 
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EXPLANATION OF THE PLATES. 
PLATE 
1. Berkshire Heleoplankton. 
3} New Caledonian Hepaticæ. 
4. Freshwater Algæ from New Caledonia, 
5. Nitella Comptonii. 
6. Nitella leptodactyla. 
7. Variation in Biddulphia. 
8. 
9 | Lepidostrobus. 
j | Lepidodendron lycopodioides Sternh. 
12. Lepidodendron lanceolatum Lesq., L. ophiurus Brongn. 
13. Lepidodendron loricatum. 
14. .Veuropteris obliqua Brongn. 
15. .Veuropteris callosa Lesq. 
16. Map A. Gleicheniaceæ 
17. Map B. Ferns of the Dipteris-Matonia alliance. 
18. Map €. Schizwacem. 
19. Map D. Marattiaceæ, 
" | Cuticles of Fossil leaves. 
22.) 
23. 
24. 
25. ) 
26. Sections of leaves of Festuca. 
27. Festuca heterophylla. 
28. Festuca rubra subsp. genuina var. arenaria. 
29. Festuca rubra subsp. fallax. 
30. Festuca juncifolia. 
31. Blue-green Algæ from India. 
32. 
33. > New species of Permian Osmundacee. 
34, | 
35. Nitella mirabilis. 
36. Nitella Wattii. 
37. Psilophyton Daws, and Asteroxylon Kidst. & Lang. 
38. Podonosma syriacum Boiss. 
M | Cuticles of Fagaceæ recent and fossil. 
41. Map. 
| 
[ The genus Polysiphonia. 
