168 rrvOCEEDiNGS or the geological society. [Dec. 20, 



Fig. 34. Megaphyton magnijicum : portion of stem, one-sixth the natural size ; 

 o4 a, leaf-scar, from a photograph, two -thirds the natural size. 



35. Palaopteris Hartii, one-half the natural size. 



36. Acadica, one-half the natural size. 



Plate IX. 



Fig. 37. Lcpidodcndron Pictocnse, branchlets and leaves, from a photograph, 

 one-half the natural size (/3, cone) ; 37 a, leafy branch ; 37 b, branch 

 with areoles ; 37 c, larger branch ; 37 d, old stem with deep furrows, 

 and at j3 areoles, not enlarged ; 37 e, leaves. Figs 37 a to 37 e, from 

 photographs two-thirds the natural size. 37/, areole enlarged; 37^, 

 leaf enlarged. 



38. plicatwn, portion of old stem ; 38 a, areole of branch, these areoles 



bemg placed in contact on such young branches. 



39. permnatum, leafy branch ; 39 a, larger stem with areoles ; botli 



from photographs, two-thirds the natural size ; 39 i, areole, enlarged ; 

 39 c, leaf, natural size. 



40. decurtatum, from a photograph, two-thirds the natural size ; 40 a, 



areole, enlarged. 



41. undulatum, portion of old stem, showing enlarged areoles, fur- 

 rows, and two cone-scars. 



42. 43. Portions of old stems, probably of L. rimomm or allied species. 



Plate X. 



Fig. 44. Portions of old stems, probably of Lejpidodendron rimosum or an allied 

 species. 



45. Lepidophloios Acadianus, stem with marks of cones, from a photograph, 



one-half the natural size ; 45 a, portion of stem with areoles, from 

 a photograph, two-thirds the natural size ; 45 b, decorticated stem, 

 natural size ; 45 c & ^, opposite sides of the same stem, reduced, to 

 show the diiferent arrangement of the cone-scars ; 45 e, part of a 

 leaf, natural size ; 45 /, g, h, areoles from different parts of stem. 



46, Strobile of Lepidophloios ; 46 a, transverse section of a similar strobile ; 



from photographs, two-thirds the natural size. 

 47& 48. Lepidophloiosp>latystigma,ivora a photograph, two-thirds the natural 



size ; 47 « & 48 a, areole of the same, natural size. 

 49. tetragonus, from photograph, two-thirds the natural size ; 49 a, 



areole, two-thirds the natural size. 



Plate XI. 



Fig. 50. Lepidophloios parvus, stem with areoles and scars of cones ; 50 a, 

 group of leaves ; both from photographs, two-thirds the natural size ; 

 60 b, areole, natural size. 



51. Cross BQction oi Lepidophloios Acadianus, showing the outer rind and 



woody axis, one-tenth the natural size; 51 «, scalariform vessels of axis, 

 magnified ; 51 b, transverse section of part of the axis, showing the 

 vascular bundles which proceed to the leaves, and the different 

 diameters of the outer and imier circles of vessels ; 51 c, smaller por- 

 tion of the axis, showing one bundle of vessels. 



52. Lepidophloios prominulus, portion of cast, from a photograph, two- 



thirds the natural size ; 52 a, areole, natural size. 



53. Lcpidodendron corrugatum, young branch with cone ; 53 a, branch with 



leaves ; 53 c, older branch with areoles beginning to separate ; 53 d, 

 variety with alternate areoles ; 53 e, variety with areoles in vertical 

 rows ; 53 /, g, old trunks, with widely separated areoles ; 53 h, pho- 

 tograph of branch ; 53 i, Knorrise, or decorticated state ; 53 k, frag- 

 ment, showing ramification ; 53 1, bark with areoles in transverse rows; 

 53 on, spore-case, natural size and magnified ; 53 n to r, areoles in 

 various states ; 53 s, leaf, enlarged. 



54. Scalariform vessel of Jjepidodendron. 



55. „ „ Stigmaria, 



