608 MR ROBERT KIDSTON ON 



Sigillaria Cortei, Grand' Eury, Bassin houil. du Gard., p. 254 (Hpl. x. fig. 6). 



Sigillaria intermedia, Brongt., Hist. d. veget. foss., p. 474, pi. clxv. fig. 1, 1836. 



Sigillaria intermedia, Goldenberg, Flora Sar cap. foss., heft ii. p. 45, pi. viii. fig. 18. 



Sigillaria intermedia, Helrnhacker, Berg. u. Huttenmdnn. Jalirb., vol. xxii. p. 43, figs. 9-10 (1 fig. 8, 



p. 44, figs. 11-13), 1874. 

 Sigillaria intermedia, Geinitz, Vers. d. Steinlf. in Sachsen, p. 46, pi. vii. figs. 1-2. 

 Sigillaria Graeseri, Brongt., Hist. d. veget. foss., p. 454, pi. clxiv. fig. 1, 1836. 

 Sigillaria Grossen, Goldenberg, Flora Sarap. foss., heft ii. p. 33, pi. viii. fig. 14. 

 Sigillaria Groeseri, "Weiss, Aus. d. Steink., p. 6, pi. iii. fig. 18 (2nd Ed., 1882). 

 Sigillaria gracilis, Brongt., Hist. d. veget. foss., p. 462, pi. clxiv. fig. 2, 1836. 

 Sigillaria gracilis, Goldenberg, Flora Sarcep. foss., heft ii. p. 40, pi. viii. fig. 15. 

 Sigillaria gracilis, Helrnhacker, Berg. u. Huttenmdnn. Jalirb., vol. xxii. p. 42, pi. iii. figs. 1-2, 1874. 

 Sigillaria rninuta, Sauveur, Veget. foss. terr. houil. de la Belgique, pi. \v. fig. 2, 1848. 

 Sigillaria Davreuxi, Sauveur (not Brongt.), Veget. foss. terr. houil. de la Belgique, pi. lvi. fig. 4, 1848. 



Remarks. — Zeiller has shown* that Sigillaria Cortei, Brongt., was founded on a 

 badly preserved specimen of Sigillaria elongata, and that Sigillaria Groeseri, Brongt., 

 and Sigillaria gracilis, Brongt., are only younger states of the same species. He has also 

 examined the type of Sigillaria intermedia, Brongt., which likewise proves to be only a 

 badly preserved example of Sigillaria elongata. 



The Sigillaria minuta, Sauveur, is similar to the Sigillaria Grceseri, Brongt., and the 

 Sigillaria Davreuxi, Sauveur (not Brongt.), is the Sigillaria elongata, var. minor, 

 Brongt., which in turn is only a different stage of development of the typical form of the 

 species. 



Sigillaria elongata, Brongt., is one of a group including Sig. rugosa, Brongt. ,t Sig. 

 Deutschiana, Brongt. ,j and Sig. Polleriana, Brongt., § of which the various species are 

 closely allied. All these occur in Britain except Sig. Polleriana, which however seems 

 to be very closely related to Sig. Deutschiana, but whether it is specifically distinct or 

 not would be very difficult to determine without comparing the type or examining 

 specimens from the original localities. || 



Transition Series (Lower Pennant Series). 



Locality. — Abergorchy, Rhondda Valley. 

 Horizon. — Abergorchy Seam. 



Middle Coal Measures (White Ash Series). 



Locality. — Cwmdare Colliery, Aberdare. 

 Horizon. — 2 Foot 9 Inch Coal. 



* Flore foss. d. bassin houil. d. Valen., pp. 548-549. 



t Hist. (I. vegdt. foss., p. 476, pi. cxliv. fig. 2. 



\ Ibid., p. 474, pi. clxiv. fig. 5. § Ibid., p. 472, pi. clxv. fig. 2. 



II While studying this group, I have to express my deepest obligation to Mons. Zeiller for sending me for 

 examination specimens from the French Coal Field, including some he has figured in his Flore foss. d. bassin houil. 

 Valenciennes. 



