170 Mr. R. Kidston 07i the Relationship 



riinged, in quincuncial order, rows of shallow elongated pits, 

 the channels through which the foliar bundles passed to the 

 leaves. The impression bears numerous longitudinal ridges, 

 which are more or less interrupted during their course; they 

 cease after extending some distance, when others spring up 

 alongside of those which have terminated, and continue their 

 course in the same direction. On the reduced sketch, fig. 13, 

 the leaf-scars are rather too small. 



Specimen No. 15. From the same locality as No. 14. PI. 

 IV. fig. 5 (nat. size). — This specimen is the impression of 

 a small fragment of the outer surface of the bark, showing 

 the rhomboidal leaf-scars. The upper and lower angle of the 

 leaf-scar is rounded ; the lateral angles are prominent. In 

 the compressed state in which the fossil occurs the leaf-scars 

 appear as if separated by an interval, but this interval is the 

 impression of the slightly raised cushion on which the leaf- 

 scar is situated. At the part marked a, fig. 5, the intervening 

 space between the leaf-scars shows a central line, clearly 

 indicating that it belongs in part to the two contiguous leaf- 

 scars, and is, in fact, the now compressed cushion whose area 

 slightly exceeded that of the leaf-scar which it bore. Fig. 5 a 

 shows a few of the leaf-scars enlarged. The vascular-bundle 

 scar is situated towards the upper part of the leaf-scar, and is 

 only indicated in this example by a single " dot." Towards 

 the centre and right hand of the specimen the bark is seen to 

 be longitudinally split *. 



Sigillaria Taylori^ Carruthers, sp. 



SpecimenNo. 16. From Camps LimeQuarry,Midcalder, Mid- 

 lothian (Calciferous Sandstone Series). Collected by the late 

 R. F. B. Hislop, Esq., Edinburgh. PI. IV . fig. 6 (nat. size). 



The greater portion of this specimen is badly preserved, 

 and nothing further is shown on the fossil than that repi'C- 

 sented in fig. 6. Of the two Ulodendroid scars, the upper is 

 much larger than the lower. On the upper part of both is 

 seen a row of slightly elevated ridges arranged in a semi- 

 circle. I'hese are evidently casts of the channels through 

 which the vascular bundles passed to the aborted leaves. 



The chief point of interest afforded by this example, which 

 exhibits the true outer surface of the bark^ is the beautifully 

 preserved leaf-scars seen to the right of the lower Uloden- 

 droid scar. A few of these are enlarged in fig. 6 a. 



The leaf-scars are rhomboidal, slightly elevated, very small, 

 being little more than one tenth of an inch in transverse dia- 

 meter ; their upper and lower angles are rounded, and their 

 * Figs. 5 and 6 a are drawn on the Plate in inverted position. 



