140 DR ROBERT KIDSTON ON THE 



( = Sigillaria elegantula Weiss). But whatever species our fossils may belong to, 

 their state of preservation has produced a fossil which might well be the Sigillaria 

 nodosa Bowman. It is highly probable that Sigillaria nodosa has been founded on 

 similar specimens to these ; but beyond a "belief" that this is the case, one cannot go 

 further, for, unless the original specimens were examined, it is impossible to ascertain 

 how much of the figure belongs to the specimen and how much to the artist. 



Taking, therefore, all the available data ink) consideration, it seems highly probable 

 that Sigilla.ria nodosa Bowman, sp., has been founded on an imperfectly preserved 

 specimen of one of the many forms of Sigillaria elegans Brongt. ( = Sigillaria 

 elegantula. Weiss). 



I at one time thought that Sigillaria nodosa Bowman, sp., was a form of Sigillaria 

 tessellata, Brongt., and a Sigillaria which is not very uncommon in the Eadstock Series 

 I figured under the name of Sigillaria tessellata, var. nodosa ; # but this 1 now identify 

 as the Sigillaria cumulata Weiss, and as far as my experience goes this species is 

 restricted to the Eadstockian Series in Britain, whereas Sigillaria, nodosa Bowman 

 originates from the Westphalian Series. 



Horizon and Locality. — Roof of New Mine Coal: Merryhill Colliery, Mount 

 Pleasant, Brierley Hill. 



Sigillaria trigona Sternberg, sp. 



PI. XII. figs. 2, 2a, 3, and 4. 



1820. Lepidodendron irigonum, Sternb. (non Knorr), Essai flore rnonde prim., i., fasc. i. p. 25, pi. xi. 



fig. I- 

 1826. Favularia trigona, Sternb., Essai flore monde prim., i., fasc, iv. p. xiii. 



1887. Sigillaria trigona, Weiss, Sigillarien d. preuss. Steink., part i. pp. 36 and 53, pi. v. fig. 54, pi. ix. 



(xv.) fig. 1 (Favularia trigona copied from Sternberg. Abhandl. d. geol. 

 Landesanstalt, vol. vii. Heft iii.). 

 1894. ,, ,, Kidston, Trans. M'ter. Geol. Soc, part xxi. vol. xxi. p. 642, text-fig. 



1893. Sigillaria subornata, "Weiss, Sigillarien d. preuss. Steink. u. Rothl. Gebiete: II. Subsigillarien, 



p. 209, pi. xxvii. fig. 106. 

 1893. (?) Sigillaria decorala, Weiss, ibid., p. 207, pi. xxvii. fig. 105. 

 1904. Sigillaria limbata, Zalessky, Mem. Comite geol., nouv. se>., livr. 13, pp. 74 and 122, pi. xiii. fig. 11. 



Description. — Stem ribbed, furrows strongly zigzag, leaf scars alternate, more or 

 less close, pyriform, occupying almost the whole width of the rib and sitting on 

 bracket-like elevations so that the basal margin holds a higher level than the apex and 

 placed towards the upper end of subhexagonal areas of the rib, which are separated 

 from each other by a straight or curved transverse furrow ; upper portion of leaf scar 

 narrow, rounded, with concave sides and surmounted by a ligule pit, lower portion of 

 scar wider, more obtusely rounded ; lateral angles prominent and situated about the 

 centre of the scar. Cicatricules three, the central transversely semilunar and placed in 

 the centre of the lateral cicatricules. A short ridge extends from the lateral angles to 

 the furrows. Areas on which the leaf scars are placed are smooth, except for the 



* Proc. York. Geol. and Polytech. Soc, vol. xiv. pp. 353 and 385, pi. lviii. fig. 1, 1902. 



