Bearing in mind these peculiarities of the area in question, we may now group in a tabular form the distinct specific types recognised in the Erian system, indicating, at the same time, those which are represented by identical species in the Carboniferous, those represented by similar species of the same general type, and those not represented at all. For example, _Calamites cannæformis_ extends as a species into the Carboniferous; _Asterophyllites latifolia_ does not so extend, but is represented by closely allied species of the same type; _Nematophyton_ disappears altogether before we reach the Carboniferous. _Table of Erian and Carboniferous Specific Types._ Erian types. Represented in By identical By related Carboniferous-- types. forms. 1. Syringoxylon mirabile ? 2. Nematoxylon 3. Nematophyton 4. Aporoxylon 5. Ormoxylon 6. Dadoxylon * 7. Sigillaria Vanuxemii * 8. S. palpebra * 9. Didymophyllum 10. Calamodendron * 11. Calamites transitionis * 12. C. cannæformis * 13. Asterophyllites scutigera * 14. A. latifolia 15. Annularia laxa 16. Sphenophyllum antiquum * 17. Cyclostigma 18. Arthrostigma 19. Lepidodendron Gaspianum * 20. L. corrugatum * 21. Lycopodites Matthewi * 22. L. Richardsoni 23. Ptilophyton Vanuxemii 24. Lepidophloios antiquus * 25. Psilophyton princeps 26. P. robustius 27. Cordaites Robbii * 28. C. angustifolia 29. Archæopteris Jacksoni 30. Aneimites obtusa * 31. Platyphyllum Brownii 32. Cyclopteris varia * 33. C. obtusa 34. Neuropteris polymorpha * 35. N. serrulata * 36. N. retorquata * 37. N. resecta 38. Megalopteris Dawsoni. 39. Sphenopteris Hoeninghausi * 40. S. Harttii * 41. Hymenophyllites curtilobus 42. H. obtusilobus * 43. Alethopteris discrepans * 44. Pecopteris serrulata * 45. P. preciosa 46. Trichomanites * 47. Callipteris * 48. Cardiocarpum * 49. C. Crampii 50. Antholithes * 51. Trigonocarpum *