part 1] THE WESTPHALIAN, ETC. OE EAST GLAMORGAN. 81 



Dr. Marie C. Stopes for advice as to the system of record which 

 I adopted. 



The following are the seams in ascending order : — 



Five-Foot Seam. 

 Middle Yard Seam. 

 Upper Yard (or Bute) Seam. 

 Nine-Foot Seam. 

 Six-Foot Seam. 

 Two-Foot Nine Seam. 

 Pentre Seam. 

 Abergorky Seam. 

 No. 3 Eihondda Seam. 

 No. 2 Erhondda Seam. 



The distribution of the plants was, in the first instance, recorded 

 in alphabetical tables— A^-Zi, A^-Z^, A^-Z^, A^-Z^— which I have 

 preserved for reference, if required. The results are embodied in 

 Tables I-X (pp. 34-52), from which all the plants collected from 

 each horizon are shown by means of a chart with their distribu- 

 tion within each class. The above-mentioned horizons have been 

 examined in this area in the course of working out the ecology. 



In every case the beds of fossiliferons shales were located in the 

 roof over the roadways, and afterwards sent to the surface for 

 examination, where the different genera of plants found in the blocks 

 were determined. 



The relation of each genus to the assemblage of genera of plants 

 at any given horizon is shown by a large graph (PI. II), drawn to 

 scale and based upon the number of plants. 



I wish to thank Dr. R. Kidston and Dr. Marie Stopes for the 

 valuable monographs which they have from time to time kindly 

 forwarded to me : I have found these of great assistance ; and I 

 wish also to thank Principal Trow and Prof. A. H. Cox for 

 suggestions as to the arrangement of this paper. 



I give below a short list of the literature, most of the works 

 enumerated in which I have consulted : — 



K. H. GooDE. ' On tlie Fossil Flora of the Pembrokeshire Portion of the South 



Wales Coalfield ' Q. J. G. S. vol. Ixix (1913) pp. 252-76. 

 R. Kidston. ' Fossil Flora of the South Wales Coalfield, & the Relationship of 



its Strata to the Somerset & Bristol Coalfield ' Trans. Roy. Soc. Ediub. 



vol. xxxvii (1894) pp. 565-614. 

 R. Kidston. ' On the Fossil Flora of the Yorkshire Coalfield (Second Paper) ' 



Ibid. vol. xxxviii (1897) pp. 33-62. 

 R. Kidston. 'Contribution to our Knowledge of British Palaeozoic Plants: 



Part i— Fossil Plants from the Scottish Coal Measures ' Ibid. vol. li (1916) 



pp. 709-20. 

 R. Kidston. 'Fossil Flora of the Staffordshire Coalfield ' Jiic^. vol. li (1916) 



pp. 73-190. 

 R. Kidston. ' Fossil Plants of the Forest of Wyre & the Titterstone-Clee Hill 



Coalfields' J6t(^. vol. li (1917) pp. 199-208. 

 R. Kidston. ' Les Vegetaux Houillers recueillis dans le Hainaut Beige ' Mem. 



Mus. R. Hist. Nat. IJelg. vol. iv (1911) p. 268. 

 R. Kidston & W. J. Jongmans. ' A Monograph of the Calamites of Western 



Europe ' 1917, p. 207. 

 W. E. Logan. Trans. Geol. Soc. ser. 2, vol. vi (1842) pp. 491-97. 

 Starling Benson. Rep. Brit. Assoc. 1848, Trans, p. 64. 

 D. H. Scott. ' Studies in Fossil Botany ' 2nd Edition. 1909. 

 A. C. Sewaed. ' Fossil Plants ' vols, i-iii. 1898-1917. 

 Maeie C. Stopes. ' The Fern Ledges : Carboniferous Flora of St. John (New 



Brunswick) ' Mem. Geol. Surv. Canada, No. 41 (Geol. Ser. 38), 1914, p. 167. 



