1056 DR R. KIDSTON, MR T. C. CANTRILL, AND MR E. E. L. DIXON. 



Description. — Stem not ribbed. Leaf scars distant, arranged in vertical 

 rows, the leaf scars of one row alternating with those of the row on each 

 side of it, varying somewhat in their proportion of height to breadth, but 

 generally broader than high ; upper margin with a deep notch, lower margin 

 rounded or sometimes slightly pointed, with frequently concave sides ; lateral 

 angles very prominent, usually on a line with the internal cicatricules, but 

 sometimes on a slightly lower level. Cicatricules three, placed about 'f, the 

 length of the scar from the top, the central punctiform, and on a line with the 

 middle of the two lateral oblong cicatricules, which are parallel or diverge slightly 

 outwards. 



Ligule pit situated within the notch on the upper margin of the leaf scar and 

 frequently difficult to observe. Beneath the leaf scar is a sub-triangular area which 

 is sometimes smooth, at other times covered with a faint shagreen or bears a few 

 short transverse bars. 



Cortex ornamented with short longitudinal more or less fiexuous lines, which 

 impart a shagreen appearance to the surface ; or sometimes the lines of ornamenta- 

 tion are individually longer and less fiexuous. 



Remarks. — Sigillaria reticulata Lesqx. varies both in the details of ornamentation 

 of the cortex and in the form of the leaf scars. Although it is a rare species, in 

 addition to the locality for the specimen here described, I have several examples 

 collected by Mr Hemingway from the Parkgate Coal, Dodworth, Barnsley, and the 

 Thick Coal, Monckton Main Colliery, Barnsley, Yorkshire, from rocks belonging to 

 the Westphalian Series, and among them there is a distinct variation in the details 

 of the surface ornamentation. They mostly show a reticulate shagreen like the 

 specimen illustrated here on PL II, figs. 1 and la. 



On the specimen figured by Zeiller (I.e.) the ornamentation of the cortex seems 

 to consist of longer more or less fiexuous longitudinal lines which do not form so 

 distinct a reticulum or shagreen. 



On none of the specimens have I been able to observe any short transverse bars 

 on the sub-triangular area below the leaf scars, which in the British specimens is 

 either smooth or bears a more or less distinct reticulation. 



The leaf scars also vary a little in form, and it may be noticed that on 

 the specimen figured here on PL II, fig. 1, the leaf scars on the left skle of 

 the fossil are only about half the size of those seen on the right bottom corner. 

 They are also higher in proportion to their breadth than the leaf scars on some 

 specimens in my collection, where they are generally very narrow, as figured 

 by Zeiller. 



It is frequently very difficult to observe the ligule pit on account of its being 

 situated close up to the margin of the leaf scar within the " notch," but it can be 

 seen at a on the leaf scars enlarged two times at figs. 16 and lc. 



Mons. l'Abbe Carpentier figures what he regards as a variety of Sigillaria 



