472 GYMNOSPERMS 



545. Seward, A. C, A petrified Williamsonia from Scotland. Thil. Trans. 

 Roy. Soc. London B 302:101-26. ph. g-i2. 1912. 



546. , Fossil plants. III. Pteridospermae to Cycadophyta. 1917. 



547. , Fossil plants. I\'. Giiikgoales Conijcralcs Gndales. 1919. 



548. , Plant life through the ages. Cambridge University Press. 1931. 



549. Seward, A. C, and Gowan, Miss J., The maidenhair tree {Ginkgo biloha 

 L.). Ann. Botany 14:109-54. pis. 8-10. 1900. 



550. Seward, A. C, and Ford, Sibille, O., The Araucarieae, recent and ex- 

 tinct. Abstract read before Roy. Soc. London. December, 1905. 



551. , The Araucarieae, recent and extinct. Phil. Trans. Roy. Soc. Lon- 

 don B 198:305-411. ph. 2 J, 24. figs. 28, 1906. 



552. Shaw, W. R., Contribution to the life-history of Sequoia. Bot. Gazette 

 21:332-39. pi. 24. 1896. 



553. Shaw, F. J. F., A contribution to the anatomy of Ginkgo biloba. New 

 Phytol. 7:85-92. figs. 16-18. 1908. 



554. , The seedling structure of Araucaria hidwillii. Ann. Botany 23: 



321-34. pi. 21. figs. 6. 1909. 



555. Shimamura, T., On the formation of proembryo of Ginkgo biloba L. Bot. 

 Mag. Tokyo 42:71-76. ph. 2, j. 1928. 



556. SiFTON, H. B., On the occurrence and significance of the "bars" or "rims" 

 of Sanio in the cycads. Bot. Gazette 60:400-405. pi. ij. 191 5. 



557. , Some characters of xylem tissue in cycads. Bot. Gazette 70:425- 



35. 1920. 



558. , The bars of Sanio and primordial pit in the gymnosperms. Trans. 



Roy. Soc. Canada 16:83-99. 1922. 



559. SiGRiANOKi, Alexandre, Quelques observations sur VEphcdra helvetica 

 Mey. Thesis, pp. 62. figs. 74. Geneva. 1913. 



560. SiNNOTT, E. A. W., Paracedroxylon, a new type of araucarian wood. 

 Rhodora 11:165-73. P^^- ^^^ ^^- 1909- 



561. , The gametophytes of Australasian podocarps. Science. N.S. 35: 



160. 1912. 



562. , The morphology of the reproductive structures in the Podocar- 



pineae. Ann. Botany 27:39-82. ph. 5-9. 1913. 



563. Sludsky, N., Ueber die Entwickelungsgcschichte des Juniperus com- 

 munis. Vorliiufige Mitteilung. Ber. Deutsch. Bot. Gesell. 23:212-16. pi. 

 7. 1905. 



564. Small, J. K., Seminole bread, the history of the genus Zamia in Florida. 

 Jour. N.Y. Bot. Garden 22:121-37. 1921. 



565. Smith, Frances Grace, Morphology of the trunk and 'development of 

 the microsporangium of cycads. Bot. Gazette 43: 187-204. pi. 10. 1907. 



566. , Development of the ovulate strobilus and young ovule of Zamia 



floridana. Bot. Gazette 50:128-41. figs. 22. 1910. 



567. — — , Multiple cones in Za;«i(iy/(;r/(/(j//(i. Bot. Gazette 88:204-18. 1929. 



