102 DR. D. H. SCOTT ON THE HETERANGIUMS 
Scorr, 1900.— Studies in Fossil Botany (1st edition). London. 
Scorr, 1906.—* On Sutelifia insignis, a new Type of Medullosez from the 
Lower Coal Measures." Trans. Linn. Soc. London, 2nd ser., Bot. 
vol. vii. pp. 45-68. 
Scorr, 1909.—Studies in Fossil Botany (2nd edition), vol. ii. London. 
Scorr, 1914.— * On Medullosa pusilla.” Proc. Roy. Soc. B, vol. 87. 
pp. 221-228. 
Scorr & JEFFREY, 1914.—D. H. Scott & E. C. Jeffrey, “On Fossil Plants, 
showing Structure, from the Base of the Waverley Shale of 
Kentucky." Phil. Trans. Roy. Soc. B, vol. 205. pp. 315-373. 
SEWARD, 1899.—A. C. Seward, * Notes on the Binney Collection of Coal 
Measure Plants, Part IT. Megalozylon, gen. nov.” Proc. Cambridge 
Phil. Soc. vol. x. part 11. pp. 158-174. 
SoLws-LaAuBACH, 1887.—H. Graf zu Solms-Laubach, Einleitung in die 
Paliophytologie. Leipzig. 
Sonws-LaunAcH, 1896.—‘‘ Ueber die seinerzeit von Unger beschriebenen 
strukturbietenden Pflanzenreste, ete.” Abhandl. d. K. Preuss. geol. 
Landesanstalt, Neue Folge, Heft 23, pp. 1-100. 
WiLLIAMSON, 1873.—W. C. Williamson, * On the Organisation of the Fossil 
Plants of the Coal Measures, Part IV. Dictyoaylon, Lyginodendron, 
and /Teterangium.’”’ Phil. Trans. Roy. Soc. 1873, pp. 377—408. 
Wiuiamson, 1887.— bid. Part XIII. Heterangium tiliwoides and Kaloaylon 
Hookeri. Ibid. 1887, B, pp. 289-304. 
WiurAmson, 1890.—J/bid. Part XVII. — bid. 1890, D, pp. 89-106. 
WinLIAMSON & Scorr, 1895.—W. C. Williamson and D. H. Scott, * Further 
Observations on the Organisation of the Fossil Plants of the Coal 
Measures. Part III. Lyginodendron and Heterangium.” Phil. Trans. 
Roye Soe. vol. 186. (1895) B, pp. 703-779. 
ZALESSKY, 1911.—M. D. Zalessky, * Étude sur Anatomie du Dadozylon 
Tehihatehejfi," Mém. du Comité Géologique, Nouv. Sér. Livr. 68, 
pp. 18-29. St. Petersburg. 
EXPLANATION OF THE PLATES. 
PLATES 1 & 2. 
From Photographs by Mr. W. Tams. They require to be examined with a 
lens in most cases. 
PLATE 1, 
Phot. 1. Heterangium shorense. General transverse section of stem. Cf, Plate 3. fig. 1. 
A. Three bundles in the leaf-base (one is missing). 
D. Double leaf-trace still attached to the stelar wood. 
X about 5. Slide S. 2793. ` 
