of Ulodendron to Lepidodendron, Sc. 169 



example. These two figures correspond to the parts lettered 

 a and b on fig. 12. 



Specimen No. 13. Locality : " Coal Measures, British." 

 Specimen in the collection of the Geological Survey of Great 

 Britain, Museum of Practical Geology, Jerrayn Street, Lon- 

 don. PI. V. fig. 8 (nat. size). — This is one of the most 

 beautiful specimens of Sigillaria discophora^ Konig, sp,, that 

 I have seen. It is about 3^ inches square. Towards the 

 right there are two Ulodendroid scars, from the umbilicus of 

 which very slightly elevated ridges radiate on all sides. A 

 small part of the outer cortical layer has been removed, but 

 on the portion which shows the outer surface of the stem the 

 leaf-scars are well preserved. Their transverse diameter is 

 slightly greater than their vertical height ; the upper and 

 lower angles are rounded, and the lateral angles prominent. 

 The scar of the vascular bundle is situated towards the upper 

 part of the leaf-scar, and slightly above the centre. 



Where the outer layer of the bark has been removed, the 

 inner surface exhibits delicate markings, among which are 

 conspicuous the little elevated " dots " that mark the position 

 of the passages for the foliar vascular bundles. This latter 

 condition of the stem forms the genus Botlirodendron^ Lindley 

 and Hutton. The two Ulodendroid scars have evidently 

 almost touched each other; but this character is slightly 

 obscured, on account of the lower edge of the upper Uloden- 

 droid scar having been slightly broken. 



My thanks are due to Dr. A. Geikie, Director-General of 

 the Geological Survey of Great Britain, for kindly allowing 

 me to figure and describe this interesting example. 



Specimen No. 14. From Furnace Bank Pit, Old Sauchie, 

 Clackmannanshire (Coal Measures). PI. VII. fig. 13 {^ nat. 

 size). — The specimen, the figure of which is a quarter natural 

 size, measures fully 16 inches long by 11 inches broad. It 

 is preserved in a fine-grained, purple micaceous sandstone. 

 The fossil is an impression of what must have been a very 

 large stem ; adhering to its surface is part of tlie epidermal 

 layer of the bark. Towards the right of the fossil are por- 

 tions of two large Ulodendroid scars, whose vertical height is 

 about 3^ inches. Owing, in part, to the age of the specimen, 

 and in part to its state of preservation, the leaf-scars assume, 

 at some portions of the stem, an almost quadrangular form, 

 and show at their centre a large rounded tubercle. Some 

 such leaf-scars are shown, natural size, at fig. 13 a. On other 

 parts of this specimen the Bothrodendron condition is exhi- 

 bited. A small portion of the stem, showing this state, is 

 represented, natural size, at fig. 13 h. Here there are ar- 



