o/" Ulodendron to Lepidodendron, &c. 253 



author, as far as I am aware, who takes any notice of Konig's 

 plate, which is verv characteristic of the species. A plaster 

 cast of the specimen he figured is preserved in the collec- 

 tion of the British Museum ; it measures Q\ inches long and 

 3 inches wide, and bears two perfect Ulodendroid scars and a 

 portion of a third one. These are about two inches in dia- 

 meter. The rhomboidal leaf-scars are seen in the figure, 

 and a separate drawing of them is also given, but thej show 

 no trace of the vascular- bundle " dots." 



This, like all Konig's figures, is extremely characteristic 

 of the species, and is one of the best representations of the 

 plant with which I am acquainted. 



Lindley and Hutton's Ulodendron majus agrees in all re- 

 spects with this figure, which evidently must have been 

 unknown to the authors of the ' Fossil Flora,' as they make 

 no reference to it. In regard to Lindley and Hutton's plate, 

 the leaf-scars appear to be a little roughly drawn, their upper 

 angle being too acute and the boundary-lines of the lower 

 portion of the leaf-scar too convex. Their reference to 

 Rhode's pi. iii. fig. 1 must be excluded, as Rhode's figure 

 belongs to Lepidodendron VeltJieimianum and not to their 

 JJlodendron majus. 



From the examination of numerous specimens, many of 

 which were in exquisite preservation, there can remain no 

 doubt that JJlodendron oninus, L. & H., is only a slightly 

 younger stem of Ulodendron majus, L. & H. The reference 

 they give to Allan's plate of the Ulodendron from Craigleith 

 Quarry, as synonymous with their Ulodendron minus, must 

 also be cancelled, as Allan's plant is likewise Lepidodendron 

 VeltJieimianum, Sternberg. I have carefully examined the 

 counterpart of the type of Ulodendron minus, L. & H., which 

 is now all that is known to exist of the fossil, and am assured 

 by the shape of the leaf-scars that it is Sigillarian, they being 

 in fact of the same form as that described by Romer in Sigil- 

 laria Preuiana ] but this point will be more fully discussed 

 presently *. The figure of Ulodendron minus, given by Les- 

 quereux in the 'Coal Flora of Pennsylvania,' and which 

 appears to be inverted, is not very satisfactory, but is probably 

 Lindley and Hutton's plant. The same author gives an ex- 

 cellent figure of Sigillaria discophora, Konig, sp., in the Geol. 

 Survey of Illinois, vol, ii. p. 450, pi. xliii., under the name 

 of Sigillaria Menardi, where the character of the leaf-scar is 

 clearly shown. The specimen he figures has been a compara- 

 tively old stem, but is very characteristic of the species. In 

 fact Lesquereux here notices the Sigillarian nature of his 

 * See p. 256. 

 Ann. &, Mag. N. Hist. Ser. 5. Vol. xvi. IS 



