168 FOSSIL PLANTS. 



which all appear to be more or less imperfectly preserved specimens of 

 Lepidodendron Veltheimianum; that on his pi. x. fig. 6 (I.e.), in addition to 

 exhibiting the leaf-scars of this Lepidodendron, shows also on other parts of 

 the same fossil scars so preserved that they might be named with all 

 propriety " Knorria." It is questionable, however, if most of the other figures 

 which by different authors have been referred to Ulodendron ellipticum really 

 belong to this plant. 



Ulodendron transversum, Eichwald (Lethsea Eossica, pi. ix. fig. 8), is 

 another example, and a very interesting one, of the Ulodendroid condition 

 of Lepidodendron Veltheimianum. On this specimen are shown the 

 characteristic Lepidodendroid leaf -scars, a Knorria condition, a decorticated 

 state of the stem, and finally the large Ulodendroid-scar. Eichwald's fig. 13, 

 pi. vi., probably belongs to this species too, but the actual proof that it does 

 so is not shown on the figure, which is merely a Knorria condition of 

 Lepidodendron. 



Similar remarks to those just made on Eichwald's, fig. 8, pi. ix. may also be 

 applied to his Ulodendron pumilum (pi. x. tig. 5). The large Ulodendroid- 

 scar appears to have been partly covered by the matrix, and consequently 

 looks smaller than in some other examples, but does not seem to be 

 specifically distinct from them. It is identical with his Ulodendron trans- 

 versum, with which the leaf -scars agree in all particulars. 



It is probable that the Ptychopteris microdiscus of the same author is only a 

 badly-preserved specimen of Lepidodendron Veltheimianum. There is little 

 evidence to support the view that this fossil is a fern stem. 



Under Pachyphlceus tetragonus, Goppert* appears to have included portions 

 of different plants. His fig. 5 cannot be distinguished from a Ulodendroid- 

 scar of Lepidodendron Veltheimianum, but his other figures do not seem to 

 belong to this plant. 



Some authors have proposed the union of Lepidodendron corrugatum, 

 Dawson, with Lepidodendron Veltheimianum; and " so closely indeed does the 

 last species resemble Lepidodendron corrugatum, that Schimper and other 

 European palseobotanists conversant with the protean forms of these species, 

 and knowing ours only by imperfect figures, may well be excused for 

 regarding them as identical."! 



As mentioned in the above quotation, some figures of Lepidodendron 

 corrugatum are scarcely distinguishable from Lepidodendron VeltJieimianum, 

 but through the kindness of Sir J. W. Dawson, who has forwarded me a 

 series of specimens representing his plant at different ages of growth, I have 

 been enabled to compare them with well-preserved examples of Lepidodendron 

 Veltheimianum, and feel convinced that the latter and Lepidodendron corru- 

 gatum cannot be united. 



Horizons. Carboniferous Limestone Series, and Calciferous Sandstone 

 Series. 



Localities. British. Lanarkshire : Carluke (Garb. Lime. Series). Mid- 

 lothian : Burdiehouse, near Edinburgh ; Juniper 

 Green, near Edinburgh (Calcif. Sandstone Series). 

 Foreign. Silesia : Waldenburg (Culm). Brazil (Flemingites 

 Pedroanus} : Eio Grande do Sol (Carboniferous). 



Lepidodendron Harcourtii, Witham. 

 Lepidodendron Harcourtii. 



Binney, Obs. Structure Foss. Plants Carb. Strata, part ii. 1871, p. 46, 



pi. vii. figs. 1-10 ; 1872, p. 80, pi. xiv. tigs. 1-3. 

 Bronn, Lethsea Geog. vol. i. part ii. p. 127, pi. vi 1 . fig. 5. 

 Carruthers, Quart. Journ. Geol. Soc. vol. xxv. p. 251, pi. x. fig. 8. 

 Dawson, Quart. Jouru. Geol. Soc. vol. xxii. p. 162. 



Syst. Fil. Foss. p. 468, pi. xliii. 



t Dawson, Foss. Plants Lower Carb. Canada, p. 21. 



