THE CARBONIFEROUS ROCKS OF CANONBIE, DUMFRIESSHIRE, ETC. 765 



lower extremities. This is well seen on the cushions marked a and b, which are bluntly 

 rounded, and that this is not the result of fracture or break is proved by the margin 

 having a distinct and slightly upturned border. This example is approaching to the 

 aged stems described by Schmalhausen with ' six-angled ' leaf cushions. 



The specimens just described record the first occurrence of Lepidodendron Glin- 

 canum, Eichwald, sp., in Britain, and which, as far as I am aware, has not been previously 

 met with outside of Russia. 



The bed from which the specimens were collected consisted largely of decorticated 

 and flattened stems of Lepidodendra and Sigillarise, with a few specimens of Stigmaria. 

 The only plants contained in the bed which could be specifically identified were 

 Lepidodendron Glincanum, Eich., sp., Sigillaria Canobiana, n.sp., and Stigmaria 

 ficoides, Sternb., sp. The fragments of large decorticated trunks in all likelihood 

 belonged to the two species of arborescent Lycopods with which they were associated. 



Locality B. 



Sigillaria, Brongniart. 



Sigillaria Canobiana, Kidston, n.sp.* 



(Plate 111. fig. 26 ; Plate IV. figs. 29-35 ; Plate V. figs. 46-47.) 



Description. — Stem ribbed, ribs expanded in neighbourhood of leaf scar ; leaf scars 

 more or less distant, occupying whole width of rib, rhomboidal, upper and lower angles 

 rounded, usually with a notch on the upper side, lateral angles prominent, cicatricules 

 about the middle of scar, central punctiform, the two lateral lunate. Ribs ornamented 

 with transverse wrinkles, especially distinct above the leaf scars, but becoming gradually 

 less distinct upwards. 



Description of Specimens. — This species was fairly plentiful, and the plates illustrate 

 the various states and ages of the plant. 



Plate III. fig. 26 ; Plate IV. figs. 29-30. The youngest condition met with is shown 

 natural size at Plate III. fig. 26 ; a portion of this specimen enlarged two times is given 

 on Plate IV. fig. 29, and an outline of a leaf scar at fig. 30. This example has not 

 suffered from pressure, for the leaf scars are placed on gradually increasing elevations 

 of the rib, from the summit of which the leaf scars slope back. The leaf scars are 

 rhomboidal, with rounded upper and lower angles and prominent lateral angles. This 

 is the only specimen I possess of this species on which the leaf scars have no distinct 

 notch on their upper margin. The leaf scars are here separated by little more than 

 their own height. 



Plate IV. fig. 33, natural size, portion enlarged two times at fig. 34, and outline scar 

 at fig. 35. 



Although from the size of the leaf scars this is probably portion of an older specimen 

 than the last, the leaf scars are rather closer. The ribs do not show the elevation of 



* Called after the parish of Canobie, more usually designated Canonbie. 

 TRANS. ROY. SOC. EDIN., VOL. XL. PART IV. (No. 31). 5 y 



