THE ORIGIN OF GYMNOSPERMS 237 



Scott, D. H. (1906), The Fern-like Seed-Plants of the Carboniferous Flora, 

 Result, stient. Co?igress intern. Bot. Wien. (1905), p. 270, 1906. 



see Oliver and Scott (1903) (1904). 



sec Williamson and Scott (1895). 



Scott, D. H., and Arber, E. A. N. (1905), On Some New Lagenostomas, Rep. 



Brit. Assoc. Cambridge (1904), p. 778, 1905. 

 Scott, D. H., and Maslen, A. J. (1906), Note on the Structure of Trigono- 



carpon olivcefonne i Ann. Bot. vol. xx. p. 109, 1906. 

 Seward, A. C, and Gowan, J. (1900), The Maidenhair Tree {Ginkgo biloba, L.) 



Ann. Bot. vol. xiv. p. 109, 1900. 

 Seward, A. C, and Ford, S. O. (1906), The Araucarieae, Recent and Extinct, 



Proc. Roy. Soc. Ser. B, vol. lxxvii. p. 163, 1906 ; Phil. Trans. Roy. Soc. Ser. B, 



vol. exeviii. p. 305, 1906. 

 Stopes, M. C. (1905), On the Double Nature of the Cycadean Integument, Ann. 



Bot. vol. xix. p. 561, 1905. 

 Stur, D. (1883), Zur Morphologie und Systematik der Kulm und Karbonfarne, 



Sitzimgsber. K. Acad. Wissen. Wien. vol. Ixxxviii. p. 633, 1883. 

 Ward, L. F. (1904), I. The Pteridospermaphyta. II. Palaeozoic Seed Plants, 



Science, vol. xx. pp. 25, 279, 1904. 

 White, D. (1904 1 ), The Seeds of Anei/uites, Smithsonian Miscel. Collect. 



vol. xlvii. pt. iii. p. 322, 1904. 

 (1904 2 ), Fossil Plants of the Group Cycadofilices, Smithsonian Miscel. Collect. 



vol. xlvii. pt. iii. p. 2>77i 1904- 

 Wild, G. (1900), On New and Interesting Features in Trigo7iocarpon olivaforme, 



Trans. Geol. Soc. Manchester, vol. xxvi. p. 434, 1900. 

 Williamson, W. C. (1873), On the Organization of the Fossil Plants of the 



Coal Measures. Part IV. Dictyoxylon, Lyginodendron, and Heterangiwn. 



Phil. Trans. Roy. Soc. vol. clxiii. p. 377, 1873. 

 Williamson, W. C, and Scott, D. H. (1895), Further Observations on the 



Organization of the Fossil Plants of the Coal Measures. Part III. Lygino- 

 dendron and Heterajigium. Phil. Trans. Roy. Soc. Ser. B, vol. clxxxvi, p. 703, 



1895. 

 Zeiller, R. (1904), Observations au suj et du Mode de Fructification des Cycado- 

 filicinees, Compt. Rend. Acad. Sci. vol. exxxviii. p. 663, 1904. 



(1905), Une nouvelle classe de Gymnospermes : les Pteridospermees, Rev. 



gencr. Sci. vol. xvi. p. 718, 1905. 



