168 Mr. E. Kidston on the Relationship 



longitudinal fissuring of the bark mentioned as occurring in 

 the last described specimen q{' Lefidodendron Veltheindanum. 



Specimen No. 11. Small branches and stems of Le-pidoden- 

 dron Veltheimiamim^ in a beautiful state of preservation^ with 

 the leaf-scars similar to that figured bj Goppert in his Foss. 

 Flora d. Uebergangsgebirges, pi. xxiii. figs. 1-3, are extremely 

 abundant at manj localities in the Calciferous Sandstone 

 Series in the neighbourhood of Edinburgh. There also occur 

 frequently examples with leaf-scars which agree in character 

 with those named hepidodendron [Sagenaria) eUiptica by 

 Goppert * (PL IV. fig. 4) . This is a common form of Lepi- 

 dodendron Veltheimianum in Scotland. 



Sigillaria disco'phora^ Konig, sp. 



Specimen No. 12. From Devonside, Tillicoultry, Clack- 

 mannanshire (Coal Measures). Collected by Mr. T. Mitchell. 

 PI. VII. fig. 12 (nat. size). 



This example is preserved in a fine-grained micaceous 

 sandstone, and is the impression of the plant. The outer 

 layer of the bark is converted into a bright coaly matter, 

 which has adhered to the matrix ; hence the fossil shows the 

 inner surface of the outer cortical layer. Towards the left is 

 seen a portion of a Ulodendroid scar, on whose surface are 

 exhibited in series, which evidently converge towards the 

 umbilicus, several rows of elevated little dots that mark the 

 position of the vascular bundles of the aborted leaves. The 

 remainder of the fossil is covered by the leaf-scars, which 

 vary much in size and shape. At a, fig. 12, they are very 

 small, some only measuring about ^ of an inch in their trans- 

 verse diameter ; their upper and lower angles are rounded, 

 the lateral angles sharp and prominent. The vascular-bundle 

 scar is slightly above the centre. 



On the greater portion of the specimen the leaf-scars are 

 rhomboidal, the boundary-line of the leaf-scar being slightly 

 raised. The position of the vascular bundle is usually indi- 

 cated by a small tubercle, but sometimes this appears to be 

 double. On none of the leaf-scars are the vascular-bundle 

 impressions clearly seen. 



Remains of the foliage are indicated at several points at 

 the margin of the specimen. The leaves appear to have been 

 very narrow and long, and are single-nerved. Their complete 

 length is not shown, all of the leaves being imperfectly pre- 

 served. Figs. 12 a and \2h show a few of the leaf-scars 

 enlarged, to illustrate their variation in form on the same 



* Goppert, /. c. pi. xliii. iig. 7. 



