ARRANGEMENT OF FOSSIL VEGETABLES. 177 



I. LepidodendiTon. — Stem scaly; the scales leaf-bearing, surrounding the stem spirally. 

 In a subsequent number, what are here called scales, are denominated scale-like cicatrices. 



This genus is subdivided in the first number into two sub-genera, but this division is not 

 noticed in the additional species quoted in the succeeding numbers. 

 LepidotcR. — Scales convex. 

 Aheolarice. — Scales sub-concave. 



2. VariolaricE. — Stem shield-bearing, or warty; shields leaf-bearing, surrounding the 



stem spirally. 



3. Calamitw. — Stem striated, intercepted with sutures at the articulations. 



4. Syringodendron. — Stem arborescent, in the form of pipes agglutinated together, with 



naked glandules surrounding the stem spirally. 



In the second number the following genei'a are given : — 



5. Bhytidolepis. — Stem arborescent, streaked longitudinally with elevated wrinkles ; shields 



surrounding the stem spirally. 



6. Flahellaria. — Leaves part stalked, divided and expanded like a fan. 



7. Schlotheimia. — Stem jointed, contracted at the articulation, verticiUate. 



8. Annularia. — Leaves disposed in a whirl, inserted in a proper ring. 



9. Nmggerathia. — Stem as thick as a goose-quiU ; leaves alternate, approximate, reverse- 



ovate, half embracing the stem, pectinato- toothed at the top, the remainder of 

 the edge uncut. 

 10. Osmunda. \ This and the following have no generic characters assigned to them, 



I I . Asplenium. j the recent genera being referred to. 



12. Botularia. — Leaves verticiUate, expanded in the form of a small wheel. 



The third number contains the following additional genera : — 



13. Lepidolepis. — Scale-like cicatrices truncated at their top. 



14. Tlmites, of Avhich he gives no characters, but refers to his figures. 



15. Antholites. 



16. CarpoUtes. 



17. Conites. — Fossil strobili. 



18. Sphenopteris. 



19. Polypodiolithus. 



20. Myriophyllites. 



21. Phyllites. 



22. Algacites, which the French translator, on obtaining the opinion of Professor Agardh, 



has changed into Sargassum ; that celebrated algologist having considered it as 

 identically the same as that genus of recent alga3. 



The genera thus successively established, may be arranged in the following order : — 



A. Fossil plants of unknown origin, in which the stem is large, and forms the only, or at 



least the most prominent character; including, \. Lepidodmdron ; 2. Variolaria; 

 3. Calamites ; 4. Syringodendron ; 5. Bhytidolepis; 13. Lepidolepis. 



B. Fossil plants, of imknown origin, in which the leaves form the prominent character ; in- 



cluding, 6. i^/a&f/tov'a ; 7 . Schlotheimia ; %. Annularia; 9. Naeggerathia; \2. Botularia. 



C. Fossil parts of unknown plants ; mc\vid\ng, \5, Antholites ; 16. CarpoUtes ; 17. Conites. 



